Malicious PDF — malware analysis report

Static analysis result for SHA-256 6945b6803996d6d7…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 23:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 401f795cdcc2c1a0790db4e0fbe3bb7d SHA-1: 91e5383dcdde7971716e013a6d781bbc49f9e05c SHA-256: 6945b6803996d6d73f3599b903db166ed16e1742f0264c63510eb7b6c657849b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised websites or disposable hosting, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious content.

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 https://cructi.ru/uplcv?utm_term=pokemon+blaze+black+2+randomizer
    • http://0975811252cool.linker.tw/files/xalasibujixemusuwofanexit.pdf
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/dupofoxupodebiseba.pdf
    • http://ototavandosemesi.com/resimler/file/xezorugepatefa.pdf
    • http://oppedisanorobertosrl.com/userfiles/files/bugiburu.pdf
    • https://pinkrali.com/calisma2/files/uploads/xixugebovagokubukujuxal.pdf
    • http://dooroc.com/tk/upload/file/93248505277.pdf
    • http://feynburg-uhren.de/uploads/fozuxagibonibiwetorukumal.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/06f0744af34fdd1747946a985cc85054/pinedavakiruvajanup.pdf
    • https://chrmglobal.com/userfiles/file/voboxa.pdf
    • https://securitydm.net/slicice/file/50175053623.pdf
    • https://igescanada.com/ckfinder/userfiles/files/94463405550.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/9516445539.pdf
    • https://heureka-cz.eu/files/84082601307.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/77527433491.pdf
    • http://roland-toys.eu/userfiles/file/momezunido.pdf
    • http://nationalcoopadvisors.com/userfiles/files/wijuduj.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/fntk4iruht41r4ie9qusdbcrli/75389455952.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141608b4e615---pawobuxaxulo.pdf
    • https://poganyvolgyi.hu/userfiles/file/gusakababubovuno.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jubovu.pdf
    • http://hotel-ambassador-nice.com/upload/files/57371916897.pdf
    • http://papaicountrylodge-longstay.com/user_img/files/tawakefaralusabawelowateb.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142c0ea9625c---zerub.pdf
    • 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_off0000ea21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 16792 bytes
font_01_sfnt_off00010233.bin
66b1f1bddcb03203071ace7258754acb5fe5a7b0c857391b2a918c6f97bce2f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 19496 bytes
font_02_sfnt_off00013490.bin
31d9d5358c61f1a1a2346eb0f74cdec4240d5711ad7c887ff82cb7d7b80b3a86
pdf-font-stream PDF embedded font (sfnt) at offset 0x13490 10676 bytes