Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea03f3c1ae5cf4f…

MALICIOUS

PDF

96.5 KB Created: 2021-09-18 10:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1828ba3f72e15a15b72d51b9047bc282 SHA-1: 3e4d93a4cc7d04d010e940276f1172787c7f5203 SHA-256: 4ea03f3c1ae5cf4f385f27ef82f06d4d9d11e44a7eb0fdcafd87ad27901ec6d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to host malicious content or redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://paramourpourbebe.bettygagne.ca/userfiles/file/bozudidujev.pdf In PDF document text
    • http://vertex-decor.com/userfiles/file/jidef.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6a0ed0b9946630fb0e39b97dd44b382b/3692447098.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/55969319869.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/nejuwokezigedesifovane.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/99681023497.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614064632a9f1---56058164440.pdfIn PDF document text
    • http://greenld.com/userfiles/jojanutakufosufezasojax.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/27267999470.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137c3f6ac3ea---22338093265.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/37149945968.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/73025041631.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/83720616857.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/911bde6e2d786e349a8089229406339e/59198096150.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e0ef607aa046f8ed5e495a84cd3fd2f4/92803355040.pdfIn PDF document text
    • https://eetravel.net/file/xomexuzotudi.pdfIn PDF document text
    • https://elemonbg.com/Files/File/xewarivabafizisivapu.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/kijat.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/b23c0bfa3f261642d704dc715c79bb11/xivafusisagun.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/87734955785.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/godal.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/93921448018.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/jixolatod.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/63811724273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+keep+stoppingPDF 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_off00011597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11597 10432 bytes
SHA-256: 6a24fd947a448293a58345cf7e4ad6c7addf8cd94d86db32912724dc088000ef
font_01_sfnt_off00012d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D25 17908 bytes
SHA-256: 353852edeea85a024d68fb8def965703279672d6a90dc9a7487eb99d7bf4eb22
font_02_sfnt_off00015c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1