Malicious PDF — malware analysis report

Static analysis result for SHA-256 2638affc7bc23298…

MALICIOUS

PDF

116.5 KB Created: 2021-08-27 12:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ca4f07413266eaafaa5a6f6ca838d640 SHA-1: 6d28ffc576c5bf739b2a3c11ffe6309120770554 SHA-256: 2638affc7bc23298e9cae868657379d9c3f7f258a5bd21e834fe24aefaabd660
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=conversations+with+a+spirit+pdf PDF link annotation
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokimo.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/gedufitamatelis.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/xawutanuxenuzag.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/32783372127.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa48d987349---1755505473.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/5463219483.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/subinolexazo.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/92422443051.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/neviximazowiborizet.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6d577af32---nenuxuripaxatefatalaje.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/26e435f8c87abd6625217c73624af7da/10046015212.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/15409610543.pdfIn PDF document text
    • http://ibb-online.ru/f/file/tefob.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/55840936075.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093c65c7872b---80737224678.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889fe776edf---89408522631.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/kewakajemuze.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/tajonepodadexodif.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/fawivisikin.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ch897b03vopng4s1pfptb3mmts/tafopazalagaxowojemiluf.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/jokula.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/64544288114.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/bobojogokulok.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/24217630445.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_off0001626f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1626F 10732 bytes
SHA-256: 6abf4cc9107ffbabb9b27df04c877e511f1264faa6d330d81d911190cc34dd88
font_01_sfnt_off00017b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B29 19152 bytes
SHA-256: cd8922bd38c76d338419ff4621880e80048327f346750b5cc5b898a3c0bb2d57
font_02_sfnt_off0001aadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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