Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6b1324795a7c0e…

MALICIOUS

PDF

89.7 KB Created: 2021-07-06 12:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d838fb032525dc5beba6929dd05c73fd SHA-1: 4ca907b31b8a2ea053e388dc9f7112ab058c29b3 SHA-256: 8d6b1324795a7c0edbc9fa05e6e499a94929e9cb9d3bb1286679a6b3453b388d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the presence of many external URIs indicates a strong intent to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=resection+of+the+spleen PDF link annotation
    • https://avenue102.com/uploads/file/zalovisetogijobirov.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ms8o15tf6avioaki7ma3fhk6m2/1451820392.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071c6357c6d3---godotoxita.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608655ae971eb---zokilitirepopen.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cb6161173---81860425504.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/73297050276.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/wogivakiba.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7418aa6a---manikaxuxalovef.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/2k2pca7n5ia7o30t6u1pdermcn/29222820914.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a5ac433bc39b5dbba5100721bfccdb35/61777552292.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/pilavojunidumu.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/nvlt3djbkit1d8c8pi88n4u3s3/falidusojapo.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/ae56301656f1a31f6f925f64a167d362/gijebapokuxenobez.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c20f74d8d---75609541976.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/penalitop.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/libeg.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6a6b0623a781184de02587d10b2bcc1d/sonuxi.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/4873280b93d545640e4182c6e2402fef/99214746693.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/nagewoje.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e5f7ed59---90133615754.pdfIn PDF document text
    • https://menu2uplus.com/images/file/72783248606.pdfIn PDF document text
    • https://vestol.bg/files/file/46598391800.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9424ba2b---biwizokumodogunitolen.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cfafcf840aa---59914385586.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_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 16664 bytes
SHA-256: 4a7f920cf3b2a7f53e4a97dde2f19371bf0eedf5e1f9c6b7b84a85257f1d44b5
font_01_sfnt_off000129f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001420b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420B 10360 bytes
SHA-256: 41a2730f9ad5f05697ebbca5dfa87a01e7b03e9acb11b0ce77b219ee41b864f7

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