Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8ad86e4a976b3f…

MALICIOUS

PDF

96.8 KB Created: 2021-06-29 06:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4390989bb78ec2ad915a702b7b9e9dd9 SHA-1: 600cbb0d9638865efe6b7bc461e66681f7ab5c43 SHA-256: 9c8ad86e4a976b3fee174c53729bf2e24e164423e50f5fc74da5f033665c5fdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc78bf41eb---98681629531.pdf In PDF document text
    • http://imbirimbir.ru/files/72427183923.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a28baa9519f---fukamagomokudigawi.pdfIn PDF document text
    • https://tavio.ru/files/file/pidatetijuzim.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/damoronogew.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6fefb4ac34afb3eb38f439442ea3411f/kigedegojurimakuwezew.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fea9783bb---mewitazatodepewipibu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb312af8c---2151784729.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/motetubopijujojiba.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/45858426796.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dcd8439e3---61130279532.pdfIn PDF document text
    • https://masihpt1.com/contents//files/73086341774.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ch0m4jsjonact2dkq238r06kn8/goluko.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160811643338fe---lesekelum.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/509692c5578c5c9fa7a7d6cb8bcba255/tosozeme.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096913441edb---wajiwidili.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2548082556---775576509.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///56518114234.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abbef26afbc---42030366597.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2680ab61---97408596901.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/57138551578.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a329b0a252e---42133702464.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47f76b32e30c3ed12509556178327161/fodifokukumobutig.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/17775370148.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/99214772897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+graveyard+book+pdf+free+downloadPDF 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_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 20184 bytes
SHA-256: d10f876bbdf01d75bf4b797f844474fc7b5d59f5b719e0f535d70fe0798d8b33
font_01_sfnt_off000144f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F4 10880 bytes
SHA-256: 64ed0caaae27228c50e6a9e2143e7595f82425fec70eb43dbe9a953a6f211618
font_02_sfnt_off00015dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1