Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebbb287cf9d3ae3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 09:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 28f291b8d6f833972da6c74c62b27a7c SHA-1: 17c7a0f0ca9c3c53355469db474c51840f5c0aa1 SHA-256: eebbb287cf9d3ae3b427df19aab8d56e8d3ebb93de37f684c02aa69649155b32
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous unknown URLs strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.findvoters.com/userfiles/file/livaretekijelagakakalam.pdf In PDF document text
    • https://eldorado777.ro/upload/editor/file/69680347959.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/zojapajafutazalavibebifal.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/90419822653.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/nukufepez.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/48705970550.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/zututivojeva.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/dobizivinab.pdfIn PDF document text
    • http://tchid.net/userfiles/file/45879758510.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/11778058128.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/nolinajojevek.pdfIn PDF document text
    • http://alltechsro.cz/files/joregifubularove.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s48qfpgmha53avks4o80797564/82321957999.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/buxirefimowo.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/37156770598.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/xufasibodinopipelanuximi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/689nrshv4emsnnd9870oa3ivo0/56828596207.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/358a668fb4613355a8dbc63001bc3fd5/sewojetejalibatevamoni.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/buxawalekepobeso.pdfIn PDF document text
    • http://azizolace.cz/images/file/xebizu.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/bafis.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/52099661075.pdfIn PDF document text
    • https://renetravel.ro/images/files/niretowapipexogu.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/temuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+does+the+triangle+icon+mean+on+my+samsung+phonePDF 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_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 11168 bytes
SHA-256: 72bf114a74a019557249333d1e72ae4076dfa7c38e6e2bbf9905776e6a066469
font_01_sfnt_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 19192 bytes
SHA-256: f41b9710db9855f156298ba0e8d16927f810a2def4d88dace76a1b4edadb9766
font_02_sfnt_off0001225f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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