Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6d8cd63a7baaa3…

MALICIOUS

PDF

83.7 KB Created: 2021-08-25 15:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d44eab41a5836fe0287bb538b6fe1df SHA-1: fe6461f46886f56ffed18be13e585f5f2835d258 SHA-256: 6b6d8cd63a7baaa365ea533667fd29c3421776a2d16051bffcd366fa8a68e68f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://nomylo.ru/uplcv?utm_term=abomasal+ulcer+treatment+cow PDF link annotation
    • http://toyotarent.kr/FileData/ckfinder/files/20210815_FB74459A6B0F8E04.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63340d65b---nogujadajejiwox.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c574b78151285239c2ce3f745058fb3a/79050410509.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/90837043050.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/c1kbifj5mbfejr2r0e303gqvfb/zuvanozasijagidepomuf.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba13e71e4ad---jivunugafipenerizofo.pdfIn PDF document text
    • https://linoforti.it/file/gugogelitelizubiw.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/nutafopot.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57ed80c657---pigivisewitikux.pdfIn PDF document text
    • http://lovesenergy.com/file/fewudamuxanoviromewif.pdfIn PDF document text
    • http://strihaci.cz/userfiles/file/nutegogexamusejatodat.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/48sk0k3rv1fuk14vlus6lvgt8i/pumitepofusuzu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05555ca056---35908203871.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/juwejurajatawunakixotom.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/sabetaxag.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/1472018617.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089384938bc0---viwabaza.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/940036462b6f785a6abe00020432e330/tedimozifoz.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/63634415759.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/67510258383.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/bajolusifig.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/58047784371.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/91496452140.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/tvcsfqlimie1q4m463b4qdnr55/63423182868.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_off0000e685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 16056 bytes
SHA-256: b3dd08ececbdd5930524b10efc40e7632dd1de4f2d08293b92a01efe278a7124
font_01_sfnt_off0001100b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100B 10608 bytes
SHA-256: 1b597ca5acbdc58bd8ea60647ec41238382e62497c6dccae531678430db95421
font_02_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1