Malicious PDF — malware analysis report

Static analysis result for SHA-256 19deb638b65c4295…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 22:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 79156847d7fec8f062a58a53dfc23af7 SHA-1: 589dc34be2409e0fe203aa1f44b98e04155b52ba SHA-256: 19deb638b65c42953efba2f3d15eb9580fc154e930d987df318e4057715582f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these rules are designed to identify spam or phishing PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=arm+muscle+types PDF link annotation
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ffdc567c7---kuriwipulew.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/512610426.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/91800974545.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4lrr4hi48fav156psvgsd99bk3/87061755504.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/koxoviz.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/nupetusuratapixadugub.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/46664955630.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/menatefotodabide.pdfIn PDF document text
    • https://go2germany.ru/files/file/66885080549.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/5h364q7es3tpp5375s5o6rc4d6/1705994951.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/97gi6aj3oe2ucb9ofruk4rdm23/mefiluvanasaxotoda.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd940f2898---12179107768.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/24435e9e022d9fcbd63679fff24f46dd/sojevasafo.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/rezisak.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/gabepagazuzesekixi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2734d1b679---paxujetitax.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/401611ba5ca326bcfdb69684d7414dd4/judonifak.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/tutazuvovu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a813b65b3---lozutim.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d239d8632e7ed232daea773606e6bbc2/36155518603.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a693e45a5a---62386762362.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/55576629219.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/41823550952.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_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 17840 bytes
SHA-256: ad706ce2264acdb36dff4c3752c5991e68f40801f2e77b3983f34512d15f68da
font_01_sfnt_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 10252 bytes
SHA-256: 82b60c459b1d21f956167043ca31e0099c337222ab71aa8d32b0ec305deb55cb
font_02_sfnt_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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