Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ea686ace4dca89…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 04:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dbdd2eee6bfb2136bed8ebc4bfbd21d8 SHA-1: 33c8b9241cfa0e457cad1ed87a6331c3c6d2d90a SHA-256: 09ea686ace4dca89ce98a0128d3ebc607c50c0a93d02ac399b2ea201d3c7f1bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external PDF files hosted on potentially compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_URGENCY_LURE' suggests the document may employ urgent language to prompt user action, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uij6b8o7dseolkfpn2sndj9s80/baponat.pdf In PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/67291917648.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/14401040654.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/845c5bbbcfe410b4c33cab3ebc418478/tuvevatemorobogek.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/jirurigunemagavapap.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/pifaruvuji.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/42486361780.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/wisofinemufotojoj.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/zufalumavatefuvemusinet.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/larukanisofo.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/34307005850.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/timaf.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/romevolajugopunefikezuza.pdfIn PDF document text
    • http://clingac.es/d/files/11937150344.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/bapefebokupu.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/79928184007.pdfIn PDF document text
    • https://ms01bet.net/contents/files/57088702113.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/labazuzukidikaxuwa.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/vaduxoxixesugozufux.pdfIn PDF document text
    • http://usateatop.com/_upload/files/4417768702.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e7c3a1d1e---bakipopoguzozuko.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/govikefow.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/komulisokumonibago.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/97011677088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pdf+na+epub+onlinePDF 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_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 10368 bytes
SHA-256: 91ef27481ca4d7b6701f6e704dc4202aa03a11e550e2c6feaeefe224bbc4defe
font_02_sfnt_off00010c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 17196 bytes
SHA-256: 91853940d34e26f9220e6e31f8503f11421734667753c309a9bd89352ddf6a71

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