Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee67cf545d99847…

MALICIOUS

PDF

67.5 KB Created: 2021-09-26 04:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 35b1a1c0bbde661e901c773ebb54ec46 SHA-1: cc55f7f3cf5ed9013383d1a0172f5d4fc5258bdb SHA-256: 8ee67cf545d998475f505d5f325ab762ecbf004db01538a60686355fe71ba50d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, further supported by the ML classifier and ClamAV detection. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/uplcv?utm_term=2+line+apk PDF link annotation
    • http://tt-ural.su/admin/ckfinder/userfiles/files/tifodonemaruzo.pdfIn PDF document text
    • http://flirdining.com/uploads/files/lutudaje.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/8982646391.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/gaxuluritavegilafi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/eou07u5nod9c0vd8mh7aphljq0/lifaxiguzakabuvuguparebu.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/duvidepone.pdfIn PDF document text
    • http://gibisch.biz/files/files/fuvurituxe.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/20853073183.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/tedomorolude.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/dapogeritexakaz.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/731cd7835da786f0ef2b258f96f7c5f6/zamexedixizasesa.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614485be687d7---29824303159.pdfIn PDF document text
    • http://ktcz.eu/files/files/64138231752.pdfIn PDF document text
    • http://abwessex.com/uploads/files/79999010201.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/31246224364.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/24620695903.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/90997196460.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e55a4fc06---75083094201.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/12166199512.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5a42fa79b92df33573b12758377d36e4/budiwabak.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/bivusepidiberimo.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/pexapufafigurogafo.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/38086691795.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/6420609173.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_off0000aeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C0 9876 bytes
SHA-256: d81724b39fef1aaf83a6ca7e897d636b0d2d5e42eea18f8e7594a2fcad09a5cf
font_02_sfnt_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 14588 bytes
SHA-256: 2e03c19f7e233bec299d17ad742dcb792afd1e285567ece781cc0dd69d84679b

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