Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6907e32834dc43c…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 04:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a409b2b019dec8cdb3ba7ac81a0847bf SHA-1: 45568d114ea700be6dfa4ca768bbdd2e57521351 SHA-256: d6907e32834dc43cb8bb57024ba952dec79b52aae1ef8b7041ed57c27bd8aada
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to numerous unknown PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 http://capesociety.ca/uploads/files/vibunorejujurupo.pdf In PDF document text
    • http://retailcop.ca/files/95103407578.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/jukipizivexowupese.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/vabupugam.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/6361104069.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/92149372639.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/19682101713.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/nigesofagulodisugawosut.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/nobixovoxibaribuneteverud.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/25206944565.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/22844041461.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331ec27270a---bobebajinevamekomedegamij.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/17768171775.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/befidumura.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/36899675286.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/58953639147.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/fufavozedinurelukosuw.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/tiwonazekavopex.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7bfbe941---xibaloluwo.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/2978283011.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f27e87700---polevozuxu.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/notasejukiso.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/88606539731.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340ed35a277---97962762687.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/xusuzidesalovelabapudapev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=binge+tv+apkPDF 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_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 15304 bytes
SHA-256: eca1e031d2cc5d5dce9334f37fc699b175585001f1c0a5e6f20b3b868b2e4a90
font_01_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 10204 bytes
SHA-256: e38087ba1d0865c4a0df21ae8b40b6e372671ca09d451db0d1dd1d8cd25150bc