Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb2cd28b5a44601…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 11:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4282a56d45289d81b17236cd1e187805 SHA-1: 17e4a989590fdae98930d5d38a77d37ab67eb694 SHA-256: acb2cd28b5a44601aa1f969f0d495b6bb0a978571807eda3d1e5e997d7e23852
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload directories, which in turn host PDF files. The presence of embedded JavaScript, though not directly executed in this context, is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions. The primary attack pattern observed is the use of a link farm to distribute malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a203e0d3e5c---nafesarokawedabiki.pdf In PDF document text
    • http://mwflower.com/upimagesfile///87850158625.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/22888068903.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/vogudisunurad.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/zedunapovavivupajefimi.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/3593574562.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/kinuwojogajulowez.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6a7d1336b---vemerejekubutodalufatu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608611bc7bb3a---zenoviwo.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/72381889005.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3e44705f1---31498900580.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/82d28918b2eaea0ffdd7d86dbd641444/kagemibitagunururego.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/7u4g8hl92o14v1jc86r2jo40ps/runidajog.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2b3304fd9816f3e20cedb610b2c39e8a/gekirobulewo.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/49556463023.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160798da1c272f---53755218597.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/31851deab2a8ac6977aaf58f75e85fa3/4737816459.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/55888940326.pdfIn PDF document text
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/famutodizidebe.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/finatenedofisoxujugor.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/84007129752.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/34761607832.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/kixufutukilinawe.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/29500456722.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/uaamcvnnetjkt9kkaa4hi59005/dofikiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+find+font+name+in+pdfPDF 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_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 17264 bytes
SHA-256: 847443b9e77ebd94804aff9e661bd2ea5f624a785c7b7a37797fb31121fc6be0
font_01_sfnt_off00011068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11068 10424 bytes
SHA-256: e60ac3072747a6f57065707961a13bf20526e9aeba3b24fd9b038ec8ff6c0308
font_02_sfnt_off000127fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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