Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e710e89be36fbe…

MALICIOUS

PDF

86.7 KB Created: 2021-07-20 08:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 04301099d67b389662026a512a43f9e7 SHA-1: bb57f8db4e4bafb4ec1e5ec9100754bceedaceb4 SHA-256: a3e710e89be36fbe9021970695814d32e54fdeba8c0b7882ee0621714d1e1390
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links are likely intended to lead users to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c569fd9edd---zuwoguvimisokikidobik.pdf In PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/63be5b00e2e23907eb794a548ffe9f3e/bodilejizegupusosolel.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/gawemidaxekubotuga.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efd877014b4802321a1bf96218337593/64559916147.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be32076767---89035196523.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/7864217163.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16083b4a4cc86e---1138489719.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8de02ac2a2---97417853381.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/cb1f0888183fa3dbff0d282ca9ddff86/78615376536.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8d86834c---1213348662.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5f841f1daec4fc93175fa2ef2f9c8aed/davatiwulete.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ru6flgl4upubj691dirr08f7m2/92820315900.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2ae8fe52---18860783048.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c4e55d87c76c26243fcb849ebf646fe0/dotujifujekagoxud.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/31135387538.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8c9fc605f---nasajakuruvijutag.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/34082883915.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/mudemalumixolatebeba.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd5d7c30f---94835858552.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/jolaxosugafotojovew.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/xukitanorubizetobaxo.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/4761289811.pdfIn PDF document text
    • http://imi.vc/upload/files/jadirawudan.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/36e9e1d83c642e063dd029fce649594a/zawobofot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=top+artists+in+the+worldPDF 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
stream_002_off0000ecef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xECEF 10540 bytes
SHA-256: 3aeb2b7cd81b80e601e38795ecad9f48196ea11a5c5e8596e94870282e4f267a
font_01_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 18304 bytes
SHA-256: 0ba68bdb3af4ef8dc4c2d15544c694c8b8502080be1687b50b68066b46fda1e0