Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e44e791275fa25f…

MALICIOUS

PDF

91.3 KB Created: 2021-07-29 22:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 952fda6d8e763b6d5e15d7984ce819a7 SHA-1: 999984632e5a745f11b54f2c0760b2d190efcc5d SHA-256: 7e44e791275fa25f7564e58049cc369db68c73906a7d17b41fe7a748c024c635
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 websites, some of which are hosted on compromised CMS platforms. The presence of numerous URLs, many pointing to disposable or suspicious domains, suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://dongzzang.com/userfiles/file///simexolopalitajosodaxunas.pdf In PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16093bda4651d5---mavukozolegege.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6f23fe16ab31571608c705f965fab521/36753885702.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/8465883677.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/rivujojegemunigefenonorap.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/54797399744.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/mubazi.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/tazajeme.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/cc451ab79cdb1351db721639ec7481ef/61015111956.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6c676f2b---60465945444.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/13042721047.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/63309684941.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/zuwejolazutuwalorupozal.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73d42c0399---beniripuvezagominavo.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/verekavosuderawobebajep.pdfIn PDF document text
    • http://emannsltd.com/userfiles/73028846322.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/57388790802.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/40199350614.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/pedunobiketegusixoxafaz.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/63790376184.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0657542001620345810.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/duselotamovikolo.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/0debrafjq3sfh1ar8cj4sl6hd4/mefepivisebajuperuxi.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4638853ab---9427965617.pdfIn PDF document text
    • https://blugarden.eu/file/vivivonajoruzilekimokux.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160850de23093e---fotopusekovomajoridoja.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/59310115076.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a8587a587e7---45370559335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=exercicis+pronoms+febles+amb+solucions+2+esoPDF link annotation
    • 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_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 20596 bytes
SHA-256: 477d9b044876e2fa09d0a843162e77923dd0bc411928e063e6b1e96dae3898d3
font_01_sfnt_off00012bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 10988 bytes
SHA-256: 901c8162e5335194f35e4c1269420ea3acac58de1ad3bfc9699e1b9a01d92c6c
font_02_sfnt_off00014527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1