Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81d617cd96bf564…

MALICIOUS

PDF

73.9 KB Created: 2021-08-28 09:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 429cadc31a87ad2df4151e01c5d9fe33 SHA-1: 0113c31543cece9b9a8d3c1991f73fae16abc939 SHA-256: d81d617cd96bf5649306eac8f114f6e58380562073c1661727ab24097b9534f5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of multiple links on disposable hosting further supports a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160902a7dda11f---fapomide.pdf In PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/32hom1domru1ltg7cnb66eikaq/16180553119.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c0137e190---58863107663.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/82784243004.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/junewuvisojapi.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/89e5fddb4a878dd51e3162e10c243525/7648792001.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/notibolebelavapejoguwem.pdfIn PDF document text
    • https://akemi.ro/hirek/file/64150797998.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b9519763cd71a4fb78f46086af4556c9/75554057263.pdfIn PDF document text
    • http://vning.net/filespath/files/20210806130202.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/97731477088.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160cac08178191---70331212231.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/457eru0us06qjq8isp4eqpm4sc/xafuxa.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/13300229911.pdfIn PDF document text
    • https://hssanesteban.cl/files/jufovipozinizof.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/81804877444.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/relanevujopowopa.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/aa1c380d995f9b39902b2afc1bcf4f7d/10143877420.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/68548354009.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/pidowoxim.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160717e47f3307---64126376139.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/72916820616.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05fd4665a---69826596534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+tropopause+is+the+boundary+betweenPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF95 16196 bytes
SHA-256: 8fb81b4d883dd85f7e2d5b3de8c15897aa224ad7ab8008794a25aa79dae465e8
font_01_sfnt_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 10848 bytes
SHA-256: 27c872057f174cb0970e0310b9c4b6711322bc1120b5f14d6d39323e02a80733
font_02_sfnt_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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