Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdb6753f777e4c9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 20:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 827e7768851c74f72c582b9d8fcfcaa5 SHA-1: be95739c8c993b59b7862ada098600101816cd8b SHA-256: 5bdb6753f777e4c9390e4e7de1b33ae85bf327f7b4131e3486c5a0ec085a2d1a
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=mitosis+multiple+choice+questions+and+answers+pdf PDF link annotation
    • https://mai-avto.ru/upload_files/file/budovovunusali.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/88758799687.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/86487327314.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/76475802027.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/zosibowidoxojitodawamo.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/43764536666.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/gapipuk.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/zozogelelupijepug.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/77567955905.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/86864165410.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/gilitiwijigigumogakazixug.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/55131087590.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lesenegebiro.pdfIn PDF document text
    • http://skisun.it/userfiles/files/29825800988.pdfIn PDF document text
    • http://remobudostol.pl/pliki/rujupubuxitowufavilotu.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/bisibesibowamogesed.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9a6d2574becf015e60fb1e74271b5caf/zolukijanirusebixotesobu.pdfIn PDF document text
    • https://grouptm2.com/contents/files/69008249187.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136ccf01e04e---36773478232.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/bekozesoduxobivurimo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134227f3f3c1---pafal.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0dd7340f57ea8b05329d6f9bff2e7be7/kovigefafovatu.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/zatezulopodezoxuj.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_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 18124 bytes
SHA-256: 73be575500845104a5ee55073654ae2f91f07c7b66551b48d87a40ba8558c039
font_02_sfnt_off00011c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 11208 bytes
SHA-256: 28a37c2cc167fca5400299cd8fa585e53322d39ff9e0edf3d368c1495f943f69

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