Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19b4b3349760b0c…

MALICIOUS

PDF

92.6 KB Created: 2021-06-27 15:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6eb0a5356a007aa223e6430a4c095489 SHA-1: 5db0da0263a13f99751465745af689cd63c1b700 SHA-256: d19b4b3349760b0cc9569e2d29f1959eb9deefb4e43e7e155328a4b743d372c2
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 compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and compromised CMS upload links supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://angkorphotographyguide.com/userfiles/file/sunoxumetefuveza.pdf
    • https://kalitelivideoizle.com/resimler/files/27997991704.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf980a225---ladanefidatusunavajulel.pdf
    • https://memoservicesrl.it/file/85189055375.pdf
    • https://ajur.rest/uploads/userfiles/file/rebogevavoretijawizo.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/0b1d2c7c903d4f5dc8bf85b6b1227f42/46957444175.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2422a657---nazujewomaragobisosareg.pdf
    • http://mea-travel.pl/userfiles/file/lolumomafilurutazulipan.pdf
    • http://dajuicebarus.com/uploads/files/fudumekas.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f388922a42---valupedozuzotizakofusux.pdf
    • http://didocrosby.com/imagenes/file/94188492807.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160763c294a02a---fupojulenokixa.pdf
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/39326098022.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf2dc94c3---pajidenurane.pdf
    • http://www.tobywells.org/media/fckdir/file/41700103467.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/67936059963.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16097656786622---42118657756.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7c67a3fcedccdf0d18e6e015d4a88642/tetorexuxavonokejer.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b1027a8a---sifiritudetetiwuxutida.pdf
    • http://sibservis.com/ckfinder/userfiles/files/74695872944.pdf
    • http://anipetkingdom.com/webroot/img/files/jimiferudoje.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a395713f36b---kawajiroxitezunar.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/920850a0a533ae44d7fcf253279b1680/gebabutuz.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609362a1754a4---80916460546.pdf
    • https://etonbio.com/newsLetters/images/file/dolebu.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160999f2a22188---93171732183.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=self+hypnosis+for+energy+and+motivation
    • https://lapdonline.org/file/rotuwu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f11f.bin
eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 16132 bytes
font_01_sfnt_off0001068c.bin
096e9a2efbb72074e9c9207a4af01a769e0ab56e7a985835b59fefce1b37694b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 16844 bytes
font_02_sfnt_off00013207.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13207 16792 bytes
font_03_sfnt_off00014a1e.bin
767ee86a36a9c41ca1eb9efd7f2be43605e224037cc31f8c73439a6cc70192d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1E 11200 bytes