Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb8dac9746cff31…

MALICIOUS

PDF

89.4 KB Created: 2021-09-19 15:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4d8af6ca9f8053ac18281f5b720fa3e SHA-1: a1f4f00de4d70e4a27ad3e4e04dbc33a1904fa4f SHA-256: adb8dac9746cff3146726e40225357607b33385e485675855a49a60f8a6a304d
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest this document is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://nicolalazzarotto.com/userfiles/files/23637105668.pdf In PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/najexinovapawemedoloki.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/renosirafobonevinesuxevew.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e92f95004c8b7ea395fafc6baf3060a5/buged.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/zowasu.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/2571823155.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614050ba701b0---morezobukekili.pdfPDF link annotation
    • http://kingcraftviet.com/uploads/ckfinder/files/94689187379.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/jutulotasoxit.pdfIn PDF document text
    • https://umutfm.com/resimler/files/domal.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/kogizitewepagudufigiwej.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/57903247546.pdfIn PDF document text
    • http://full814.com/upload/files/runekiba.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614464429e0cc---49140320784.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/fivapabaruwobavuki.pdfIn PDF document text
    • http://fittbikese.hu/files/file/laxobikik.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8c4205df---xexajapofe.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/34402394386.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16142cb54ab0b0---99686976275.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/52243069741.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ija9rpuihfr39ptfvcst05qp0h/mivokavazele.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/38364524393.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16141140f58aac---levidabamilagosinigi.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/22914620871.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/9740150106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=can+i+update+my+android+version+to+10PDF 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_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 17948 bytes
SHA-256: df2c6ee3bcc68eccfcfd746f21e1682fbaa4bd2e91eafc8ab114737fede5b12e
font_01_sfnt_off000125f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F8 10992 bytes
SHA-256: f7daa4ae0058f8abca556335c04b2efb444cb99ffa4a7ea419a291aa916e1076
font_02_sfnt_off00013f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1