Malicious PDF — malware analysis report

Static analysis result for SHA-256 c634ba2ab25aa941…

MALICIOUS

PDF

71.6 KB Created: 2021-09-10 08:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99782124ef076be8b2771676bd4ee2cb SHA-1: 785763783a2e83314235129cbbb7543a52bfe2a7 SHA-256: c634ba2ab25aa94135aa8bceabea360d877f490855090bd111123ba0f0139528
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files. The presence of multiple links on disposable hosting and compromised CMS upload storage suggests an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329c7a0291c---51685775463.pdf In PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/65719128972.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/zozusavelogafolizonedel.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/75324f8d13e110d1181ccab91bfb6028/14703046528.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/39014779164.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e15812fc---37576396257.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/mugoxub.pdfIn PDF document text
    • https://blv.by/upload/editor/files/69440250972.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/gimoki.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/sotelenumazegipaxase.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/xafinurikuperifopopari.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/pagilaned.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/22393803225.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/92386727923.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/26130556081.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/xixenusu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85664f8b2---63251859850.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/50477508294.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/borosapaxemovimifexodoso.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/40281292804.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/54069636875.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/tekejuj.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134c210e2e80---19749652510.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/kowekeboravarenuk.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/gijiwonebiviwubew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=simple+past+tense+exercise+for+class+3PDF 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_off0000b4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C8 10992 bytes
SHA-256: 99672dc1c97753b8d5311901f93eb0114dac22e774fb942a77222c50958b0bb3
font_01_sfnt_off0000ce45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE45 17412 bytes
SHA-256: b23d8c676e16df215511115c255d525235ffd66536224ddcb2579ef74e8b2bc4
font_02_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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