Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f916c9405bbd56…

MALICIOUS

PDF

82.6 KB Created: 2021-07-18 03:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9e4e69e43c7386eba3f64329ffaf365 SHA-1: f4bde7508fc5611d4dbe14f33d4712cfc1c2720b SHA-256: 06f916c9405bbd5694a2846ccf61d9d1b23a97cda4d71d7b1fa7a33d98f4740f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely intended to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://stalbeckers.nl/userfiles/image/file/losodomamoluwulek.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/oar4p1ceu3lq6rsi68k6n32k45/kumewur.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7d8fce33a---26905356382.pdf
    • http://imcborivali.org/userfiles/file/sekor.pdf
    • http://scro.ru/pic/file/tesuvugumeladukibopu.pdf
    • http://amirafouad.com/uploaded_files/file/69192159531.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/72429498515.pdf
    • http://charivne.info/images/file/ruropikupifuzowetekonovo.pdf
    • http://zaun-produzent.de/userfiles/file/fopixi.pdf
    • http://birnagarcollege.in/userfiles/file/kemowaxifotunul.pdf
    • https://mudraconsultancy.com/uploads/files/nunizumisuwalunomurigu.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d2f0d605---dazizuzemizavaxel.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/u5eedfn75i7odjla7oa6kenn70/bevetogakedodexi.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071911b5af6f---samopigufenu.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/afb1d0704ad24694bc576b9c40a47b14/63506638391.pdf
    • http://pomocnaukowa.net/Upload/file/48828274012.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hvv8n048qo9jd4o7dbpc7as216/33581169016.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/91834566742.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a02132789ad---96027028551.pdf
    • http://learningkey.org/userfiles/likatapofa.pdf
    • http://firewheels.pe/userfiles/file/31868104972.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/24065531f86cf9819c7d7110280b7fd5/93546437842.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210503165456.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b3148607---jejupozezedikinigoxerit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=4+differences+between+aerobic+and+anaerobic+respiration
    • 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_off0000df89.bin
2b13ac40796d131c3bf717d088b8fbdc2e20b65e18453f18b8cbd9c725949ef2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 16932 bytes
font_01_sfnt_off00010ba8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 16792 bytes
font_02_sfnt_off000123bf.bin
5e9394f0734bfb3694ea79daa8730957f57f71a68fe26e76f66161daaf982f6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 10772 bytes