Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2de662ca55e3d44…

MALICIOUS

PDF

94.2 KB Created: 2021-09-04 18:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ccb650e94c4ac8d1a6b6f259dbc3332 SHA-1: 389c14a636b48d8dd4b62d9ca18b01892f686a44 SHA-256: d2de662ca55e3d44f51fa9557d6010fac756c56c443d535bd326009244b1bfc3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised CMS upload storage, suggesting it's designed to host or redirect to malicious content. The heuristic 'SE_CALLBACK_LURE' indicates the document may also contain deceptive text to trick users into calling a fraudulent number, a common tactic in phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aee9abb341---mugipawosisafixotovepu.pdf In PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/5bd0142c7155fe85dfaf5555bb7dd390/26658787965.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/durusixijolipatavavake.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/60384355658.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/31823447765.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/bcccc3021f5725455c42c09748cb5d30/durivesogurezomiseso.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bs5q5vkvjfceuhkf8hn0mhg3q1/kowofipuxikavovokike.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/74995301205.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/73669012902.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5m6gaqju8mi3eg1v5dj4db62r5/62354120985.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/97590202725.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/37847265856.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/vazupajetazaxuzeturu.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210611141728_1784806878.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607decab01d25---3026228858.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/sefimibo.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/tb7mt913i4p07ep74qdj8hjvpi/960404340.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/90630875226.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/88679622680.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/77756945290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=john+rawls+theory+of+justice+summary+pdfPDF 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_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 18756 bytes
SHA-256: a68c05d619ec6af34af1992d8b9c4fcc1cd58504400af4674e967ef4731155eb
font_01_sfnt_off000138d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E9 11308 bytes
SHA-256: 8cadf7dfb6e8e60b2d1c2cf8c83ec7207985c4420f543a4f226feca43b2fe699

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