Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08d8efbdd36b61d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 15:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0e257d0f7f925062ba81297a3e6217a6 SHA-1: e556da5ec5808198ca9ddf8d8c80a338f790d403 SHA-256: f08d8efbdd36b61d12e6cdb781e7aadeec7e8cb3724c997be6d2e74c8edde9bc
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malware. The 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to bypass gateway security. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107696e931e8---fofatogudedojipitodaza.pdf In PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608463abebf40---niranedulavotoze.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/mobevajazidadatos.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/41408736018.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/gatoxov.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/91642684501.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///47062693412.pdfIn PDF document text
    • http://balone.net/_upload/file///gulelosakujorowovas.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe8bb7d918f---xewatub.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/votoga.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/pagefutuvunokiwidano.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/85950943128.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vulikorajonifugexesutaj.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99ba84c01---85862940003.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/kijeko.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19c92071d---79877970844.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/8344315496.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/844648147.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/63192751971.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/mikurumakikuves.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/gevikagirudisaruzobakuf.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608927cd6a63d---saropilonefivefole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=verbos+irregulares+em+ingles+pdfPDF 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_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 10952 bytes
SHA-256: 7921d3db73189aa538f48cfd8971a5c10c280a6b6880a07e4dbd61e7522b48cc
font_01_sfnt_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 18420 bytes
SHA-256: 2397761f907e68a4ee8aba0eee46a0a3ad7b301e518e800b929078f5ff12c6ce

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