Malicious PDF — malware analysis report

Static analysis result for SHA-256 68953096aa77c93c…

MALICIOUS

PDF

85.6 KB Created: 2021-07-02 13:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c54ff940c1c0a033c4d5fe30ee7bf40 SHA-1: 3529b84d2424eb2c89406a2cc9352b050eccfd4e SHA-256: 68953096aa77c93c6e2a3d5d99e9c7924d1f866a1a277ebf75137fadbdf4b95a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristic indicate an attempt to lead users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://afghansolar.com/userfiles/file/pepiwiko.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/34173cadf8c88e184db04d5db451fee4/pirup.pdf
    • http://matsonconstruction.net/userfiles/file/8012583773.pdf
    • http://bkdesign.ee/userfiles/file/tufamaralupe.pdf
    • https://steammining.com/userfiles/file/fimiletasexeteda.pdf
    • http://andlupa.com/userfiles/file/22975549342.pdf
    • https://nada70.org/userfiles/file/kakiperazatakewizu.pdf
    • http://unipsyclinic.com/userfiles/file/20210508130903.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2a289774---vofopokusatitagom.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072c00245077---vawewemulabetolurenip.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/q59j5m464b2gvpk02h7v56l2t2/64162250135.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a6378975---mofowuvebejinugot.pdf
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/wimazakokutuzeropora.pdf
    • https://smithsgame.com/calisma2/files/uploads/varifadudozoxo.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f7e1b6388---7349882687.pdf
    • http://superlitefan.com/uploads/files/32866937690.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/35180f076cfac38460802423f7bea649/nomonejadogovipazubiku.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d3426ddf6c7f1f8509b51a1962acaea2/23498499987.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/81cdbf5dc7d3c371640c21624d2e9269/39651642626.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/266cbd53bbda42eb930584ff1c5f1696/46671077672.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/3107b081c1d420499f05caa2e55a9d43/giwubedogagox.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/31825438755.pdf
    • http://emailreceptionist.net/userfiles/file/36906615160.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/227a1e56526599bcf935a6623c60b5c7/gadotut.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/16819736414.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=2nd+birthday+wishes+for+son
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed98.bin
dd56f96801e92042f58a6b847ba90454a60f5e2bb79694d96cd99c3f0627d922
pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 16748 bytes
font_01_sfnt_off000117f4.bin
d6bea44c80428af9ea3c77a7f050912c5a739e39c1733316d57aa9f88b53491c
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 10768 bytes
font_02_sfnt_off000130d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D0 16792 bytes