Malicious PDF — malware analysis report

Static analysis result for SHA-256 1628878a179ea21c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 07:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c05bf999a95d4f3f0cb7c173a048719 SHA-1: 5e3a7309595f37162e09d8ff845a1c0a44b16fbf SHA-256: 1628878a179ea21cb290423798864f6cd04c0999154019fa5177232a7204abc2
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations or disposable domains. The document body was unreadable, but the presence of multiple external links and the 'SE_CALLBACK_LURE' heuristic suggest a potential phishing or scam attempt designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://marblobath.com/app/webroot/img/files/mivipotomonaxivo.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161330be12851f---98766118442.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/fizipabimufenazeb.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/90263300560.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/donaposuwak.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/24469591887.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9ed442bafc2a96d8e8374d9580c9c077/sobirurawerimiwata.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/80984856134.pdfIn PDF document text
    • https://wita.lt/images/files/jozojidabekojedekadovonax.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161408845f41af---mupasuzunibuful.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/8561022351.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/bf6ed47c5cfc416187513d075b3e352f/fovowesejejukilapinem.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/80994371603.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/lajutetejatesemawakuba.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/46289719858.pdfIn PDF document text
    • https://digicpictures.com/downloads/visolikafemiwuxaduro.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/lusuxifipipanowupoko.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/9165121317.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/kijumoje.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/kaxevekiboxamuxefirixovo.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161350df1e14a0---35684682890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=vidmate+apk+old+version+download+2018PDF 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_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 18016 bytes
SHA-256: 2554d0e14c91e29dbc163afc7d9330366832e6455a95f050b9c480d42d022781
font_01_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 11268 bytes
SHA-256: 93b6fb779f20f7773d707922894ef82e914d2fe8951828acf183c6982e8afe05

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