Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5e4839aaf653ba…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 03:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c70c7abca21c855cef1f582660bb3ea9 SHA-1: 1a4a1697d6d29625848d0018a4f6180d069e2fb1 SHA-256: 2f5e4839aaf653baa1b773e4232382cc4ed2971ad8b13659e5700024f1a9e2b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to distribute links across various domains, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=unix+commands+pdf+file PDF link annotation
    • http://museeducuir.org/upload/files/mulamomejotenukegibop.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a862b6fe0e---20358381044.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/lanudogobelibel.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a52a451f41---16751843366.pdfIn PDF document text
    • https://hojoairport.com/images/file/mepusotur.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/15784695280.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/61553756608.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/lusokanususe.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/55878127108.pdfIn PDF document text
    • http://ridendo.cz/files/file/pikugib.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/xuvagujixojumibawi.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/limafudofexoxatatasaxumer.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/pekidekunelezimamepopegib.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/75269267300.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/rjr12vlrs89ldnavddh7f3iodn/78485430023.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd90dcd48a---9519431698.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/51811364837.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/qiarrm0g701mlofc049ha98br6/fupekunipizoririguzigo.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef71632d21---37950281605.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/poduxeposekusapuwaz.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c64010612d---65461478487.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/68607459435.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/72914424708.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/fexepijibukaregunojunat.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_off0000dfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 10692 bytes
SHA-256: cc17ee35cc4d67acfd3e7209950720bc1e851eeec669d6874b2f667d58e7c36d
font_01_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 16988 bytes
SHA-256: c6e89f3cbb87c2db71ba194252a57d320fe7cbf9574728439890a0e7f90dd89a
font_02_sfnt_off000124dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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