Malicious PDF — malware analysis report

Static analysis result for SHA-256 abefcb233f7bdf59…

MALICIOUS

PDF

94.5 KB Created: 2021-07-18 21:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 09928cc70ddd6d213b2da59102100add SHA-1: 5eb9fd5f246df4ec26469c47b881c67b1967d55f SHA-256: abefcb233f7bdf5995b4d76715195844ecf5a1c8eff01e699a65fa1687ce9cfd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, potentially leading to further malicious content, and includes a callback lure consistent with tech-support scams. Although no scripts were directly extracted, the presence of numerous embedded URLs and the overall detection profile suggest it is designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://sanruou.com/app/webroot/uploads/files/volikadunepuxobime.pdf In PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/20119687364.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a1de9326b86---sukazukojeved.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/39540355360bf291f94a02.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/savaselalulejoraxozikuxe.pdfIn PDF document text
    • https://giustofiori.it/file/53987036412.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rawetafokogonazolumupap.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/337756e737e2127252bceed57651880e/34297522787.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/40558707874.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/jenafulorupobowuxapowolij.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/zodib.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/glfrl6a8b1esqpni5truvc6g4v/52142478811.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d025ed45dc7---49391254821.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b05cccb51d6---tanoxedusejedutuzagaf.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/kedilerugeli.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa88241631f---43944011447.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/95420414864.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/31632075451.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/buviki.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/fuduzalejupewazuvifa.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c75789b3e7---40871707057.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/71164433385.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/43352572969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gk+question+and+answers+in+tamilPDF 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_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 10872 bytes
SHA-256: b842c8c0f8a0a7564219f8b2ac51222b0ff928a86bba70e9b123062dd2555ef8
font_01_sfnt_off00012706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F18 17468 bytes
SHA-256: b8df9112a9b533a64a8f845fd6a9ea4e1ed970b674ddc2709142c848721331eb

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