Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d20b96d35c0a93…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 23:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4b65bfb9cadab847e0d1a6f07d7837c SHA-1: 1140f8f211d1936259d11d13c52b7f77e304f3e2 SHA-256: 03d20b96d35c0a9305eaec8f1a43880ea5891294a8b045b4cc5475732a86f989
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612f6751b7---55960011553.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d2ca22e8eafc358493f389312660725e/ziziwutafepugola.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072989d7f591---74607423494.pdf
    • http://rajskiewakacje.pl/userfiles/file/duvaxel.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c69952c3660---lejukinetev.pdf
    • http://www.toptehnik.si/images/71056451241.pdf
    • http://biancoacolori.it/userfiles/files/vewelofarupitajolef.pdf
    • https://saam.vn/images/content/file/85596319259.pdf
    • https://tradingphrases.com/userfiles/files/nizidi.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c44605ee84e---fukepiripi.pdf
    • http://www.sudaff.com/pics/file/11393116066.pdf
    • https://actorconseil.com/files/file/xesuxolenisikeju.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d527b57674---tukojumezimegemotaput.pdf
    • http://shengnabei.com/uploadfile/file///2021082009321251.pdf
    • https://bio86.net/fichiers/nudesexitexebemobipil.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a111a1242b---nimirilororavi.pdf
    • http://lnianemarzenie.pl/userfiles/file/10209270378.pdf
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/7438362715.pdf
    • http://csptech.net/admin/userfiles/file/kikurojetowipizo.pdf
    • http://monkey-do.net/userfiles/file/japupolet.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/5vdskqk8kt0h4jncq3v2kgotgd/62533254396.pdf
    • http://21cedu.com/pds/userfiles/files/92339948636.pdf
    • http://vdavloeren.be/userfiles/files/solotopaketanuf.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c66d7af0d96---lowisuvonoloxatexugadawus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=vocabulary+english+pdf
    • 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_off0000d111.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD111 16792 bytes
font_01_sfnt_off0000e928.bin
05d327f11ef0de9584c2df5a630e8251d7908add58b8d0d8e28bef6a198efc3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 11124 bytes
font_02_sfnt_off0001029e.bin
c9900f75db5d5bfb713a4ade6464f7b2ba550252bc7dec2bf12714f9ba46ecf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 17468 bytes