Malicious PDF — malware analysis report

Static analysis result for SHA-256 578b491b87600f7d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-02 22:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6d3bf5a1ae0d995320fe6a6e84f8b491 SHA-1: 1955c7fd4590ed403290c0e0b034a8306418fc13 SHA-256: 578b491b87600f7d17d2dc683f59835b3b15b829b211f22cc74b90968679df05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable domains, characteristic of a link farm used to distribute malicious content or phish for credentials. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://terezmisszio.eu/files/file/13941341373.pdf In PDF document text
    • http://hilimall.ae/uploads/files/83209106435.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/gujaxisum.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755c2ed4894---jekusiditoxufupefizitudi.pdfIn PDF document text
    • http://berbun.com/user_img/file/puxamojitoligodolasede.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/kulakuvadugebulamirukeloz.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6e6a2864bc5a2719a6f669c64d808f1f/97806387350.pdfIn PDF document text
    • http://millecolori.it/images/file/5645182601.pdfIn PDF document text
    • https://media-get.com/userfiles/files/19906438324.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/0c06d9027a4d473c98e9477ce2f46e91/48100169147.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/0lf4kn0qnsvsdeih2vhabcbgmc/66500586233.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/rilogorupanadu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/belinomolukuf.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ff87a0afb---32260176616.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/83352452510.pdfIn PDF document text
    • https://giustofiori.it/file/rebukanovadin.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/98i5rj4a5r2h0rss64qvara0d3/lamux.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/bedokesixoxazin.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/39981416493.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/gelumipin.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/7154063267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=free+printable+multiplication+as+repeated+addition+worksheetsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB093 14608 bytes
SHA-256: 8d60c2b32e75baff3938396791062374812d5f5b2e2880a81062409bf9f42c4b
font_01_sfnt_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 11172 bytes
SHA-256: 867ea78d6c992727dfc72047d4fc0a403e849aa047a2d17c479b1550e283505d

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