Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d10bffa7f5b8ad…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 11:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d11097420d52192626e2a3cc800d5ed6 SHA-1: a2c5242842450608177595ff63c86a3f403cd772 SHA-256: 46d10bffa7f5b8ad7ebbe3287e63d124aed473e5505beeca38d4cf4911d46593
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a critical heuristic firing for 'SE_SECRET_RECOVERY_LURE', indicating it attempts to trick users into providing sensitive recovery information. The document also functions as a link farm, with numerous URLs pointing to potentially compromised hosting or disposable domains, suggesting a phishing or credential harvesting campaign. No scripts were extracted, but the presence of external links and the recovery secret lure strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://vhktn.at/images/content/files/tefedekafipenematowofoda.pdf In PDF document text
    • http://designbyjoseph.com/uploads/File/gimanibawamavepewonitav.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/o8ibgfk4gjjj1momb2n4aj3snf/dunoxovupunodumos.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/tesijejadosodoxisowew.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2099989971442965cc3fd97cfa381824/45776847775.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/99264601433.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7a96a4f2f4ccbc4bacf032a32fcdd04a/85489009728.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/pajejimipigixowebif.pdfIn PDF document text
    • http://tfforming.ru/d/files/59380335096.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/52603880759.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/minunosoguwogagodeti.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/faxetovodudofim.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/94484819847.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/jemexijaf.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/19416824377.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/88822094907.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/58610546618.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/wigusuzutemolanogi.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/10951515945.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/mimipe.pdfIn PDF document text
    • https://hse.tw/upload/file/nudarozatej.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614454deea3ea---satasirapal.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/xopokudojoludobovijuf.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/zitixukepebiwasiru.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3477a876b---66853683042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+sha+keyPDF 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_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 20240 bytes
SHA-256: 6fca5121028cc61f61609f0b59a19253a5decc6cd043d1d2fa8e97745b035e5b
font_01_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 10388 bytes
SHA-256: cbae6e279debf89ee2270dd6b67a1f8fe096b7ae74633cf5f98d925020df7b7f

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