Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5996279493e138f…

MALICIOUS

PDF

92.1 KB Created: 2021-09-04 19:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c201c334bd616dd77223686250097975 SHA-1: 5ba2a2d6a8084517ac3916c2969b5b4e6537fc3c SHA-256: a5996279493e138ff939c97cf024718f6c94cd1f492e2f20b7da5e98c7bec4da
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The presence of numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggests a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic specifically indicates the document is designed to prompt the user to make a phone call, consistent with callback phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://garglob.ru/uplcv?utm_term=kenwood+dnx+525+dab+user+manual PDF link annotation
    • http://biurod9.pl/public/userfiles/file/74227847627.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/ragesuravazaxuli.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5ba5d1ec3a6ecddf181bdfe241babfe0/65148398672.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/dcfbec68e2064ffc35abcce7f89f5fe3/61232806748.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fa184245771---83344738762.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/mokomoguzisixepikin.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bc2a6294b---xawifazajemawoniji.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/24819885431.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c75211e48eb960a4bcf7273e9ba2bc9f/butolebogitaguvugopo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeeb11df12---73223923126.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd9151288c---78572342483.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf960d7ed---42929274712.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/900c9646ac5c3cd0122f157b4342c5c9/66056552076.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/80040695153.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c352d07b---peweviv.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9257f1c95203e46b313be6fc6ca99ca5/desotonaxenivikolawodusa.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/4602254443.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/5869612301.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161105e25e765b---50723101864.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb7b06b85e---11230554624.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b184c4d9---mesikexikegerobotogilu.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/nizovajibavonuvupubogonek.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/90024774467.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/38816477729.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_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 21728 bytes
SHA-256: e0f8eb48c44e503a9350aae2ab60fabc1af9d483ecd53d583e0046f4a0e54e56
font_01_sfnt_off0001316d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14984 10892 bytes
SHA-256: 0c25d793b7f02129c66b3a3cb709235d7698972e44520a2db9aa898ba0b74733

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