Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c3ee6bcda99c54…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 08:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e2ad9dbce7c69546238757d704a4c8e SHA-1: a53dbd0755b807cfd9341278a68c6f94de16a7d8 SHA-256: d0c3ee6bcda99c542438cb14a30ec979fa359ebecda4cb9f28451c769adf650a
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple disposable hosting sites, a common tactic for phishing or malware distribution. The presence of numerous unknown URLs, including one hosted on a compromised WordPress site, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://accronline.com/userfiles/file/fuvumekekekevu.pdf In PDF document text
    • https://salwangurugram.com/files/72465939961.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/tesifelexaneridut.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad98e9afa5---19501175553.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/mukezo.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/47993108201.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/ramamukakawi.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f542d79a---83792124929.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f6d208bd---87683149807.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/39177147108.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/52757156316.pdfIn PDF document text
    • http://inistor.com/ufiles/files/vedobupezato.pdfIn PDF document text
    • http://asja.ua/userfiles/file/60471710134.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/josuzap.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/gojunila.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/suxipo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e23906c9a---22647870688.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090503542873499.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/nebajaxovom.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/42333659110.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/felaxunixelamudufa.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210903061459.pdfIn PDF document text
    • http://asfalon.com/__files/file/tigufefo.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/76319792260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=metodo+de+sanger+pdfPDF 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_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 10528 bytes
SHA-256: 29d9fe0d886e0a4cd8b015ef1d5621a7b7a29cbbae654eb75393e5442ceea1a1
font_01_sfnt_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001026d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026D 18704 bytes
SHA-256: e10b2f1646508064055e9a4e120bc335a2b2c54d8995c47ead8b0f1c727e5215

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