Malicious PDF — malware analysis report

Static analysis result for SHA-256 686a2d6b3d2fba23…

MALICIOUS

PDF

84.3 KB Created: 2021-07-10 06:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1aa64dc66da55b06083c50dfcf0b496 SHA-1: 64ba68fd5824b389b73b5150ce175448c0513144 SHA-256: 686a2d6b3d2fba239172da3d08863c1c3a527dd4d17b3741a3be1f1ef969334a
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure by requesting recovery secrets. It contains numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of external links and the phishing lure indicate a likely attempt to steal credentials or sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://synerhu.ru/uplcv?utm_term=add+signature+in+pdf+online+free PDF link annotation
    • http://www.irrv.org/uploads/files/duguxuzulobud.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/lh9bv95kj8biq5ektohg3p76ch/29699567534.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c37d4698---1464494033.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/jodavunujifumijurep.pdfIn PDF document text
    • http://protok.pro/upload/files/pisujujepus.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bea190af0e---37490005512.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b00ec24019db41f3d22d1090e373107c/5630533549.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84c35e0dc---10280308516.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3219989c6---xetigu.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/lifasisujivewo.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/q0fcunjq7k01tuomg8ujm7heco/39101979999.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/95963770724.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/powatibuxuginovufaluzefe.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-5/20210705140156921286.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/pikakam.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b3217a037---voparabozowumajukodilevov.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4db9dd7d4---nuxelenuge.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/43637496573.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/82262936952.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/def93c1af9c2bced33efcfedefab65e2/21631649652.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/18084ddcf67b218a6b74d436b2144023/retikixubuxiwa.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/duzojaxanetekolobag.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_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 16960 bytes
SHA-256: ed17957b0355a1f9c00d6208634ab78096d40e70b09b9bbdfa9ec95c14c5ced2
font_01_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 10752 bytes
SHA-256: 2f013c90951fb6b0826b4421d3e7bb6afa4c7953d7cce7bd0f0c55adbf59b386
font_02_sfnt_off00012bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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