Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfa9f21a7b93d3b…

MALICIOUS

PDF

84.7 KB Created: 2021-07-07 02:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6ed89892b169c50ec4b0295e0ee8c928 SHA-1: 51f8cbe48dcd0ae5e60986cdfc7a29ed87388dc7 SHA-256: fbfa9f21a7b93d3bba81716ce8d6fc7786329068dc9b50fa185139d6f6747422
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://uniroll.pl/user_images/file/2810950618.pdf In PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/71943739476.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c03f3d8121---60023101382.pdfIn PDF document text
    • https://areicon.com/images/file/48660920612.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/3252239432.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8d4cab9b4---97134853781.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210701190833.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6iifc3pibop5v9g5tc7s7shri3/13423254265.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/makedesusejubewep.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0339a1d45---73985782478.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/47148243347.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/q3c44shi7ja8d8kmt5suod2gbt/dusesukazi.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215251743512331.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/57751670670.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e414ef061d---34595442678.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/nuledisijimirizupov.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/59105387236.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d5d1b2952---50405370464.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/e0919310ba77c90cb82327d71fb1c86c/jijotiwulajinila.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2dab734cc452e7600f0430c82cee075b/romowanoda.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dbee3aabb---49100163190.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/fufefalaxirudunugotir.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e036ae0109---zimajamomonuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=theories+and+systems+of+psychology+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_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 16712 bytes
SHA-256: 322dda46f6575b91af3454d79a836e0ce0cb606a9303c024a8789e3514eaf946
font_01_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 11144 bytes
SHA-256: d50d15ca11fe875b61dba091b5223a3bfca483496e514b9813ad13ec2ef6696f
font_02_sfnt_off00012d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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