Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fa99be361d1c03…

MALICIOUS

PDF

83.4 KB Created: 2021-08-13 16:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 776b7d3f3a1a4f0ace8030647543594c SHA-1: 3767b8a137efd7c26544c6974b22ab9d3853544d SHA-256: 86fa99be361d1c03bc478ed9ca79e6cc01ad56720b24ed4419a0ad7fad42cb74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting, likely intended to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=libro+de+anatomia+y+fisiologia+humana+pdf PDF link annotation
    • https://thefertilizerequipment.com/d/files/wazakopiwakelepe.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/19edf969b53f8ba2396f265f4a16bcb7/8409046041.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160902176036c4---70833877219.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/35721872986.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c439af1b2f0---98615788732.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/j3rup48eoom9n8th3ibpeg9fgv/rarapaw.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/69283297906.pdfIn PDF document text
    • http://candientushinko.com/images/file/fumewagaromesevulexupopi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qhjce0phduqj78sfaphphb4s92/wazezifelip.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/160273ddd2d1acdbfdbd367b1f7ae5f5/jarapom.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7f37cbeb---tebexujifupanaxup.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///28889939256.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a250becbf---72563201208.pdfIn PDF document text
    • http://patroha.hu/file/pimudinudowugofalimexefaw.pdfIn PDF document text
    • http://drironcat.com/images/file/joletozivugejoxu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a18f8b2c244---kizuwalovasusogowuxunu.pdfIn PDF document text
    • https://sy-tech.eu/file/51966054254.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/fazoju.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/bb6e5386caeb98ce7332a3c2b27be7ee/51342991132.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/43966421211.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ce9b238f885a5f69879dd816410def3d/doxepegizeta.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/wulebukawazi.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/14070131654.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_off0000ddd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 18292 bytes
SHA-256: 465e85cf8465e7d1c4074ac89171a5a55ef15b51a910744e7066cd39678999a5
font_01_sfnt_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 11256 bytes
SHA-256: 393bfe31408c73f535c5250ca1e13bf690b45957d554e40549c6fd00681f099f
font_02_sfnt_off0001264b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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