Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9cd36c64b8e6b9…

MALICIOUS

PDF

91.1 KB Created: 2021-09-05 14:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a025bdc6ea1879c094bd0c8b45decfde SHA-1: 4fc63b0f3197a6b6685f0151c1f014ea212638e8 SHA-256: 3a9cd36c64b8e6b9d789fca81bcdb66811408c8093136766c4ebe60dfc8f03a7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to further malicious content or phishing pages, consistent with a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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.
  • 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://abwlargo.com/uploads/files/35968501389.pdf In PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160805b741acbe---38001321146.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/nopixeritomo.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/94454748107.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a60b0d73b---56936367703.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/jutogodo.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/79062927271.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/55803181886.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/31739541442.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2rjh5m9tnhs5q5ve5a2gj8o1be/91724604102.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052215504273499.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdb40af7bf---68107929679.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4922d26610---46282945464.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa3be69f3---24500563948.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/nuxewi.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/wujem.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/34311215238.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/xipovisajikadofav.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b3a9b64972---fulujowaf.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/papem.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd228db5f8---60986418996.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/93024855093.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5b73c623---jifibadif.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/3914134856352d5446d198f8dd4f1ab7/wizezeniba.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3294a1734---44110029349.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/90273bb3jp6js2bn6cmn9qe9m2/witetewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=real+time+pcr+book+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_off0000ffab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAB 17864 bytes
SHA-256: 9ece7b2a23fec3c936f6b69afbb6a4e56f93647557f7718e847398cdc057c6e8
font_01_sfnt_off00012dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145EA 10784 bytes
SHA-256: 666b0d9a53ba4bfa035f495d62c4c6764c9756ba86f11ddae8ee0838d13bf1b0

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