Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9008265cb07809…

MALICIOUS

PDF

96.5 KB Created: 2021-08-09 14:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd534f952203a57f67d49c6fa0e119cc SHA-1: 40b354cec76381441533e1a35307f679a98f2d23 SHA-256: 0c9008265cb07809f257af3760323c94d1d09bf21c8663729d455e3c5ea70578
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://norservis.com/files/files/siwowidi.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c070d1acb6f---devefo.pdf
    • http://skomi.ru/img/files/file/purigadifisibenom.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a90174771e---wopatopaxikizafigatune.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077de1187c51---fazesuzixax.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e017de629052c1c130a00d28cfac4998/49827382418.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/056a0b10ee6a861466520457e56f8700/gobariwekisagofival.pdf
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/48098083872.pdf
    • https://gikguamerica.com/userfiles/file/99418697485.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbd4114394---fukoxi.pdf
    • http://denda.co.kr/ckfinder/userfiles/files/guwexulujox.pdf
    • http://portamarioarchitetto.eu/userfiles/files/vabopojefomibijiratesiru.pdf
    • http://nguyenquangcomputer.com/upload/ck/files/berawuvedurabom.pdf
    • http://onishi-kyosendo.jp/archive/82664828505.pdf
    • https://masihpt1.com/contents//files/78136728821.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d00aac951---24907188050.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc91f568fd---65733504327.pdf
    • https://ksdc.in/userfiles/file/131593331.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/68009229118.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/62901967850.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ef3f76d52---xenoturub.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/88124831392.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+games+on+a+ti+84+plus+silver+edition
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB8 16792 bytes
font_01_sfnt_off000127ca.bin
eac8c78d6bcd920f63c62706c18a585a59732e6ba757881b34af63a258accb77
pdf-font-stream PDF embedded font (sfnt) at offset 0x127CA 18028 bytes
font_02_sfnt_off00015739.bin
3c2ce48215058d2aa93528b74a3fffaaa75c5ef218a6ea427ddd676b6407b85d
pdf-font-stream PDF embedded font (sfnt) at offset 0x15739 11264 bytes