Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fcd50bd49a054e…

MALICIOUS

PDF

77.7 KB Created: 2021-08-24 16:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30fb97cbf50db8988805e4f2dabb4c2b SHA-1: 7ed103008340031e00abfcb40e04bb590715fc48 SHA-256: 85fcd50bd49a054ef83baf3a93420ad5b85c8bac143d3eebe1b912f5921990a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous disposable domains, a common tactic for distributing malicious content or phishing pages. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically flagging it as a phishing trojan. No scripts were extracted, but the structure and URL distribution strongly suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://stacjaregeneracja.pl/userfiles/file/bemuwiregabame.pdf In PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e7c6525f6---gijoxinavilutabi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0igji5718c1ddvl5b5qj04p8bi/pilazonawobarutevaputo.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/bewixadapufefixix.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/71159979154.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/gs21m01a33m4emfbohgbbg9581/juketofu.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/88141058725.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/becc48ae882dae1745e12fbca06624e1/65492931409.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/toludisoden.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/83738050234.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/thldp9l7ka9sjgd1jlb3g93oaa/80699500361.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/pexadotibawo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc4019013---sobigemadur.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bcbd61eabc080df61de1a1df36bd7733/deden.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lixudutumirudufujew.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/bowutosip.pdfIn PDF document text
    • http://3q1p.com/upload/file/210730084911268219talongw1gj7k.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/76630788683.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc662535ae---doneviwanapiso.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/10168068741.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc5956a3b---259772633.pdfIn PDF document text
    • http://partnercable.hu/files/kowoxilila.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/dejepugenajedura.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16084646f3fc02---36989977606.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/begasifupizezede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=loaded+language+definitionPDF 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_off0000ce00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 16972 bytes
SHA-256: 079677137c9d658e88d278b8e9b5c8dbd10fd64b81bde4ca5c3b0ad70602e945
font_02_sfnt_off000111b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 10320 bytes
SHA-256: 14f6a5a79e69b5d275ce5875ffa5cb0be81b3b31283ee371cf4cb7c27339f10f

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