Malicious PDF — malware analysis report

Static analysis result for SHA-256 890b7323b3ba425f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 02:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17bb5fa530ad413c27ae76676735095f SHA-1: ca15e98b7039443b4c218cfa798d0c4fdda47542 SHA-256: 890b7323b3ba425fe498c98c988da5d90a37ff54e549ddc8082d8a3c1651138e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential SEO-based lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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=remove+scanned+by+camscanner+from+pdf+online PDF link annotation
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/84246803cf937a31d47bbdf6c4d36ab0/70012699846.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ulpia5ql9mkpf5mq4dvt90ah8/julisojobeguxadovubix.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/zabexovo.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/63307102420.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/51032086ef0e4dfa3ecc2a18d9335297/46820599168.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/jopiferarusamuzepoxuni.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/nopelav.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/64941381586.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c79b14db---16336390460.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/91502709815.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/8187497172.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ad4e4112d---dipowazavedudofaka.pdfIn PDF document text
    • https://soechi.com/userfiles/file/segonibegadawuwage.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/wozenoguvimugodevirum.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210817_52200EFF2298663F.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/13852068736.pdfIn PDF document text
    • http://amandamaitland.com/images/file/savalajedaxof.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f842f1898---muzobuvonixa.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/povapedodemofomef.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bca436439e---bulikonanopakunavonalupek.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608587b60f0f6---fopugasakiru.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4288a84e0---tekedonevalosavaburuvis.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/tarava.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969592915c7---20382112480.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/mapamas.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_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 17988 bytes
SHA-256: 48056a189ba806473c95dbf7468619f1d7e0c692f8f2d5617c1c53cfc7faa707
font_01_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 11048 bytes
SHA-256: d6c3021c58afa4fe3d74b98ae8ec327a6ee69a0c10c22c20b70593d8b5741001