Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6766dc68143afd…

MALICIOUS

PDF

85.1 KB Created: 2021-07-09 02:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c47e51f66297c784a199986e2e6c286 SHA-1: 8cd8bf621d78ce4a90eecd63dcdb874899505eea SHA-256: fb6766dc68143afd1fcb8f16903094419b939720e5a8ed1b1092d8b5753e52d6
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple domains, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/kf0jaf9g21tm9aojha3ld5ip6p/2022894780.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f8391606b6f0f7969eab2e8810451e21/sodaroxaniberamo.pdf
    • http://chaukitchen.com/uploads/files/samanojerofeloz.pdf
    • http://dentherapia.hu/files/file/19251321196.pdf
    • http://ash-graphy.com/userfiles/file/divox.pdf
    • http://ackerviewguesthouse.com/userfiles/file/debekosanuzopigixipijaka.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf4f861a0---39101781940.pdf
    • http://dzbnf.com/upload/file///vogolofedewabusa.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ba0b8f243---92380729406.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb1957172---potavogigezosev.pdf
    • https://ctapigroup3.com/contents//files/62567438110.pdf
    • https://rainbowfurnitures.com/files/files/kulagesivobotapiwe.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/d1f4fcbe29b642b3acb3f2868f9520ec/88422394990.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/66560268830.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/edh931qnf6jt16g9n8sjjo17qj/11851815419.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb8b178e16---kakusosawekofuwopuxedo.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/xidija.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/13766397239.pdf
    • http://hondasushi.com/uploads/files/16305896196.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817a7543386---tebutesisudavumedewus.pdf
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/fided.pdf
    • http://shqinze.net/admin/upimg/file///17913640613.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b885ebfb34---jimijovel.pdf
    • http://czdashan.cn/uploadfile/file/2021060501592573499.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/079c2a788464d7c1850ef3c073c8bc9c/36060543732.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc444d4c1fe---vadinopo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=annotated+poem+example
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e915.bin
92f04ab2ac0fe379b901e994d48f36932dc6d0efe4dfb6c35f95a854f7d7e41c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 17824 bytes
font_01_sfnt_off000117c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C0 16792 bytes
font_02_sfnt_off00012fd7.bin
6884a7a847381f1c13012228316be93b1c8e1431a09d082fe593d12bc7face8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD7 10276 bytes