Malicious PDF — malware analysis report

Static analysis result for SHA-256 278086db12697ae3…

MALICIOUS

PDF

84.5 KB Created: 2021-07-10 12:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b735677e7d4fa4de6f779f0f000c1119 SHA-1: 351aa5520c96f2be926ee67cf75e3ad0dc766ba4 SHA-256: 278086db12697ae35bb4f332c784bc42b1146ed88bcda22a019d5443179a035e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ab4f616484a9c59d6593f8a1ced3b646/xotoredugidezaketokuv.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/70c5a7d686f9fab980615d6b0e40a426/64328178699.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/6144472165.pdf
    • http://em-mould.com/ckfinder/userfiles/files/sofoxevibarabofufilewi.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fbced4682---83955717657.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5dcc64951---63286444108.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75607ab2de---wupuwenexem.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7hvdu6kc6j8n8sj9kqo09rk03u/xukamovawitowusejego.pdf
    • http://serdceprirody.ru/userfiles/file/60875849159.pdf
    • http://www.motorradfreunde-toggenburg.ch/up/files/1978444238.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160722bacabdfb---75466229514.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a7197959de6ecfea6f647cdd90c3c8fc/63384532898.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/phu0ve3khho1hj23d5mbm2l7s6/12295449866.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/94c2efc60a441f0cbf7da3f736da562b/16396594101.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/31its7d7m1508vfckmrpud7kv1/jumepiva.pdf
    • http://belgium-ex.com/images/blog//file/gesomagemavudavagur.pdf
    • https://ancoraeducacion.com/images/nanopexu.pdf
    • http://hurtmar.pl/Upload/file/lofuniwararunodujugagil.pdf
    • https://turbooto.vn/upload/files/vutebetepop.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1054cf3d85---32817065550.pdf
    • http://dichvugiayphep.biz/upload/ck/files/96674920447.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/48a52a48531bd1b796d76a3579fccc39/batexejuravijubugukew.pdf
    • http://cariboohose.com/userfiles/file/fijisufixematosalamilo.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c318b6ad315---71007952962.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=locksmith+in+nw1
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e94a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 16792 bytes
font_01_sfnt_off0001015c.bin
4f6ec4ff694d9f1329da61fd363f4a55449174a16a152ae6050de89cac18a8ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 17284 bytes
font_02_sfnt_off00012e67.bin
94da46cdc998f5398ef4873b332e0c4a09176d4af94a76622ab2818cce3bb73d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E67 10244 bytes