Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1e3df7245c048d…

MALICIOUS

PDF

71.4 KB Created: 2021-09-02 05:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e813bba95d0806befac029dcfe2efebf SHA-1: debc4e9a151ce4167fc8c14341a9fba0087d0d62 SHA-256: 3a1e3df7245c048d76281f2edc1faa1ae6f22c6a6c28f3418b64f9514f326ffc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads, strongly suggests it is designed to redirect users to malicious sites or download further payloads. The document body is heavily obfuscated and appears to be a lure, likely intended to trick users into interacting with the embedded malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610024e060e4a---fefudeji.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ae228c735d96eee650d22d88f4506b1d/vudirumuwulota.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7fdd90aaba7e701e925b4be334ff79c0/nefowozigorez.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/62824941784.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/0pciunsjgvspkkc0gb17h1roeb/23751644487.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/6007681988.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5851288d0064d8c285441055a5bad187/putidelumofawugipeve.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c599a09ec60---25346608549.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5ceb02604de64e7ca91c3924cbe86f28/73439401886.pdfIn PDF document text
    • http://18554080.com/userfiles/file/kawujipegosuzijiwolamug.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/kirignt0q0p8fe5jpkfe9rilgr/7944968690.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/99082566043.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/61f6db22b353981044504f818cfae32f/dikewoguzobatutekudekesa.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/4vu0uo8or8uruh2hvldvb688cc/bogoxakez.pdfIn PDF document text
    • https://airbays.com/userfiles/file/47941600018.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1008b075f---vetoxujutekabutanasatora.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65cf2d69c5---81872058005.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xepuwelugofufusevino.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/rusifefenogovadimuxitegep.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d038083eb44---97545704335.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/50679715149.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/2f82ecaa9e173496344378f318cfdbce/54481434382.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/minut.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6ec198b7---lunedezojopute.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/26945509478.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607bccea49254---86012840932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=skinners+conditioning+theoryPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC84 13824 bytes
SHA-256: e8a27a553924e4d6ca2cc92b2f8da2ae711afacab8ce70cc7afdc295dd56c1ab
font_01_sfnt_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 10724 bytes
SHA-256: df4046183ab1ab7fee8ca5f659a24c19a961a37555217d205a875cb296c6a6ec
font_02_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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