Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37e43e0711b8a53…

MALICIOUS

PDF

91.7 KB Created: 2021-06-29 13:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17a46db32982aaab7c365e251070c80e SHA-1: 448743791c0c52e0bcf74f5cc22d1f6661cd968a SHA-256: c37e43e0711b8a5348a630ebfba9cc485b6a4519770b525ece3aab46b690ae62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://irlanc.ru/uplcv?utm_term=words+to+describe+someone%27s+voice
    • https://ewastexperts.com/userfiles/files/58860586936.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5g6kphj70qj5p202mtb3ioc6r7/maxugujididu.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fs8cgb18m1f9t24gahefodrtg0/52459307523.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/73999905203.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/3f0c3ef02df24924600d22cd59086ec0/pikepapomobeliwelede.pdf
    • http://jtour.vn/userfiles/file/10297884345.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/de01c3b7cded0c267f0b58416cd897bc/zaxonelimemupo.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/da0ceee7102e323a0e4395a2e33dc203/25105316847.pdf
    • http://ruoumoc.com/upload/files/75365472347.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1466ea442---78345962427.pdf
    • http://robertoantoniz.com/resources/original/file/tabalajapebogipisemo.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/51f6c636605adcf36497fad246987eda/rulomasitanajifo.pdf
    • https://airflow-skateboards.com/upload/file/kobuguxiteruzuzaze.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d233cfdf5f4---91453557269.pdf
    • http://luisacortesearchitetto.it/userfiles/files/39651006579.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087b425d55be---24344519209.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a01c87eb3---66720067931.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5580e464ff---40454344754.pdf
    • https://medtek.vn/storage/file/jobasi.pdf
    • http://drironcat.com/images/file/98618119535.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/30292593820.pdf
    • http://anma.pl/anma_edytor/file/jatiguzezujamuz.pdf
    • http://naturallabs.fr/userfiles/file/3344143406.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102f6.bin
a0d0212ad9b5362d1c72d46c19c89b42fc32830f3e735039e6899c46aa3872c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 10556 bytes
font_01_sfnt_off00011b18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B18 16792 bytes
font_02_sfnt_off0001332a.bin
738206e2ca517bf89684672a64cd0e39d372704c9d65eb0d5c14c5d107683b79
pdf-font-stream PDF embedded font (sfnt) at offset 0x1332A 17212 bytes