Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ddf7ffb7e1c57f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 18:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e32d22ea8f6acc7045d69c239178602 SHA-1: c6996558a7547d89f45cc103df3783d7f46205b3 SHA-256: 31ddf7ffb7e1c57fc7bafa3b81b1cca8b335dfec6eb8e260ae155b62d8a062cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file 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 domains, some of which are hosted on compromised CMS uploads or disposable hosting. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=sociology+test+questions+and+answers+pdf PDF link annotation
    • http://termocity.by/pics/files/mofobugobobo.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/53456763101.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/91199929264.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609859055efd7---sevipebowa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc6f5b332b---tabarazezovoveze.pdfIn PDF document text
    • http://runo34.ru/attachments/file/tomagizubafeserizuvurafad.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070484a21ae6---15041896466.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e2e96ada0---wemodamanoxupawegotamixe.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/i541oqshih39iqfm191dp93vqc/kamulugo.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/mobezagelipatugamizop.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/nilisigimijiwebodosaxef.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/36395070606.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/xukerujukenupafelagujob.pdfIn PDF document text
    • http://balone.net/_upload/file///96119075136.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/00d8f3367555877a99d5e51cea979492/91469185997.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/gofozuzevexifokigim.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160757ca92bba4---15837595013.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608106f95b9d1---4411597722.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/ravatorasiwexunuravixewa.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/27111031330.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///bidokanebeb.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/65962406344.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/tofekaf.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/jaromax.pdfIn PDF document text
    • 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_off0000d832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 11316 bytes
SHA-256: b0e018dd190df7582a98e21367d550d28c9b6fcfa67a702a7ff00bb457f18abb
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 19088 bytes
SHA-256: bc5f765098dd805326e5699b3226b21170425ac96d74bd7d117602647e6f31ba

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