Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f389bd30ee48ab…

MALICIOUS

PDF

79.5 KB Created: 2021-07-01 15:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dd39dbf6c7d4b69dd4421132423230c9 SHA-1: c4f0ea17a084f2c83e19e69e0aaca18412bb3aca SHA-256: 32f389bd30ee48ab8a31efa5f08d3229a739d5c2836033e5cd7a0cba07e1c619
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF link farm heuristics further supports this, indicating the PDF's primary function is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=science+coloring+pages PDF link annotation
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/263b79ef6c8236d9158db6736cd937eb/denakisiroj.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/87176170719.pdfIn PDF document text
    • http://schokozentrale.de/idata/milesulepebupijazidirev.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb40336b7b---638187949.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/pavobeziderubevibiwokeb.pdfIn PDF document text
    • http://henca.com/files/details/file/87802477366.pdfIn PDF document text
    • http://firegallery.ru/img/upload/kefinopataxagosavisox.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/41131477783.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/21j9q5vsc2a4r8aa8p4k22ggd8/52151418736.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/92544895119.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/votutawoneveronigunateg.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae1978c0ae---buladoponilakuku.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/54950502997.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/og1qrqvl2hdf30fidj2ncg5e0e/91397056160.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/tn109gfebht6anli8t3doe5jld/nodekomok.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/e8ofta838vsbfdcumfvh1s0lev/xisuwifotepekadelukikomi.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/pvpitvudltumkra72lc6jbki5j/fajabefaj.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d20d30b0e---76108464460.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbe878a874---kadobajubuxoziwa.pdfIn PDF document text
    • http://halaljones.com/uploads/files/jenekapamofeta.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/64724254263.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/4877191751.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/nutokadafazag.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/d2f058addd57f30ff457cdcb0ab726f4/pebasuvuzeguvunifijin.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/73177022931.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/4b33bcccaa4917ca580cbbaeacaa9cec/vifezisereb.pdfIn PDF document text
    • 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_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 10528 bytes
SHA-256: 9a37f98299cd6cf548328b1f8f3c62ed7393dfe4ee62c81d266397707e52169f
font_01_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 16372 bytes
SHA-256: d96a5be85115d10d96f74441da6c9199c64fc2e6fc9f4102c193c3c0cbeb7c0a