Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85d6ec26162c133…

MALICIOUS

PDF

80.9 KB Created: 2021-08-23 16:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7951a46a57ff99c0c8c3715de03deae3 SHA-1: f3fcdfe32c74c720b85c08889fc6d4252acac2d1 SHA-256: d85d6ec26162c133d71863ea8307eca441d175a7b1bb454261acc87adca79aee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier. It contains multiple heuristics indicating it's a link farm hosted on compromised WordPress sites, with URLs pointing to potentially malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/118ff742ba36f711e4e18e271ea9adf0/20588473187.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/31356179258.pdfIn PDF document text
    • https://lesura.net/userfiles/file/xeterizakemef.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/hvadtjkv1l14fsv4n3r2g3vig7/30335690011.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/xisojidudovikarusuxu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/7467e2af594c5d585aa0dfe60f0bc0be/64473642252.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6623bd17b---73238349432.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce900215076---27488354722.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/50089202864.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/410b1f2e819a47573585ca698aa4b623/26478324588.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/92021199027.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0a728e1323999a48dfcc4900265c7e42/70722595330.pdfIn PDF document text
    • https://energooptima.hu/upload/File/napomux.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/90612958834.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ab3f8ae60ad2daed8bbe821f4f75e1f7/15713364567.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/98179821477.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c8fca0d392---57328409628.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3e86790ed6ed78090de25d315709298a/fufimebunowo.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/71609178712.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/936fb9d48aef202fdcb536dafa170d42/kapekanuvin.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d012e567770---xiwogadobezevog.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/30cf7770614e547b1d6f8ee7b074d0ac.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bpo+interview+questions+and+answers+with+examplesPDF 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_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 16748 bytes
SHA-256: 383da90a5ee4d2b7f92bfc0e20432185a2e2d164ff77a778b24ce839ba168525
font_01_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 11208 bytes
SHA-256: 90fbd23a0641940f42ab8731416495aca473cdfbf00982b386185ce6d169c3ad
font_02_sfnt_off00011de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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