Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c6d4482e75cd77…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 22:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fbe9b17ab72187b486e81eea9b9f92b1 SHA-1: f0efaf56549e9e9105b4984f72629042f70e06e3 SHA-256: b1c6d4482e75cd775952908b735a03ccacf8cfc78a7d9622f4fe7b35d845cc35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of numerous links and the use of disposable hosting suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=il+ritratto+di+dorian+gray+scheda+libro+pdf PDF link annotation
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e95a28fb37d99785fc13286feebbf42a/69610209680.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/viloj.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/17558078245.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/vbckgnp9p3jjqat4fd98ungk2d/81370540215.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///sogefif.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5509ebe45b3e2233c9024c4dee2a562f/76199435724.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/t2mp03anf87vobg7jdhaka5o2o/wegaboxiledobujipiwajo.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/belurigizigiv.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/vubabigokoposewokakasi.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-22/20210722155236862975.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f575ad96---pemigimepufubuf.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/63192862636.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/prcs25jdti2lnkvh07ksuaqle1/44367256978.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/kedotojukazojuso.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f26dc5d8acb5cf29b176b270f5b9c89f/95079839816.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/32762365770.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f862060a71---52079500.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/29643822811.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/wujoketojuriw.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/41466646268.pdfIn PDF document text
    • https://egca.fr/userfiles/file/safomavamabitezimalun.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_off0000e2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 11104 bytes
SHA-256: 06b5d202c41ae260ecb03e52601a3d8d22d93b9c0395055c54cb9867dd0a09ee
font_02_sfnt_off00011442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11442 17200 bytes
SHA-256: 454d2748196678dffa0eaded3f4c5621f0b5ea1c1bfaa1aae59aa1fec05079d1

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