Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4c7cde1f144aeb…

MALICIOUS

PDF

86.2 KB Created: 2021-09-03 17:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ee97b00b6737aa0c508a7b02529a4ee SHA-1: 4ffb8a4de823f2eae9af4b85c73334a365eb504d SHA-256: ac4c7cde1f144aeb6168da2c51bf30fbb33cf84b5d1294dda351429914ab6a94
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, indicates a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. Although no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest it's part of a phishing campaign.

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://pixomot.ru/uplcv?utm_term=cetoprofeno+gotas+medley+pdf PDF link annotation
    • http://wwm-quanta.com/upload/files/ramegu.pdfIn PDF document text
    • https://rcot.org/userfiles/file/minizawexikexokuluzobi.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/95246494899.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/rewiwivilulevevasu.pdfIn PDF document text
    • http://novichiha.ru/pic/file/pebisa.pdfIn PDF document text
    • http://isgsrl.it/images/file/67348840187.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5adebd28aa---76347801748.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/0itgadiflmugtu4s1f15pkr912/93724432356.pdfIn PDF document text
    • http://wjcopy.com/upload/files/97188166487.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1623061451.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c29b8401d---92309780755.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/1bfbecd7f26265ec64cd939e8ada4a51/besetodo.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea68293883---vepelilonetogobujazana.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/xirafuzoxofolijoduka.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd201f3ea3d---33045132701.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/80361853985.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a0707fc5---72392297910.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/19173176604.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/59164575565.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/mawizonizububerunaxonuse.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/tagad.pdfIn PDF document text
    • https://biocoils.com/img/file/xudajek.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/lebadesemesi.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_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 19228 bytes
SHA-256: 9d777cb4624fd5e64491c243c16d58599c76ef27986f2b8b0174943b9145f982
font_01_sfnt_off00011a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A1 10892 bytes
SHA-256: 9e42f262176f91f87268d9b20546e30f3372dcb9864d12bfc395c3b345d57820

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