Malicious PDF — malware analysis report

Static analysis result for SHA-256 03157717d01972c4…

MALICIOUS

PDF

78.5 KB Created: 2021-06-28 16:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4851fe32074817e22d19c049e468199 SHA-1: d12ba5a785726d7dbbe736002eb346537f869205 SHA-256: 03157717d01972c4711b1a00c291d5958ed066e556ecbb02765395c112f58900
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5421066aae---51807435438.pdf
    • http://owv-sad.de/userfiles/files/99452230829.pdf
    • http://gernano.eu/gfx/userfiles/files/kavetavabavugekuworike.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/1960343757.pdf
    • https://alrashed-alsaleh.com/userfiles/files/25181357432.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c95e92d56---40145726489.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e24b8b1ec---96911384459.pdf
    • http://zabradli-znerezu.cz/userfiles/file/zowuluxomomuzowadumudogu.pdf
    • http://bluecars.pl/userfiles/file/1291499957.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609652f7c1e07---17815646592.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/donowubuzela.pdf
    • http://meteosputnik.ru/userfiles/file/85576735118.pdf
    • http://optykglowacki.pl/obrazki/files/zubakel.pdf
    • http://thaoduocvn.com/userfiles/image/file/sexexebimetifew.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p4hmpaaqeuckqr3q9a9rrirdjm/44420505307.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7e3f8d8ee---17422433260.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608064d534974---vunabusapatofirolesax.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19cfc1fd94e7705fdac64db934648248/dabogogiboxo.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210620/172744425.pdf
    • https://samngaimarble.com/html_upload/file/notisakoxabazilazeta.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a579d5c6---59288571161.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d016a107e1---xinijojupojofofumujux.pdf
    • https://careersourceokaloosawalton.com/files/public/16600926246.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=classic+trans+am+for+sale
    • 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_off0000cfb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB9 16792 bytes
font_01_sfnt_off0000e7cb.bin
473f331e32c4cdb88842df4eb74b44099f36a3b145b7201a62c2ca90c1184ad6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 17084 bytes
font_02_sfnt_off000114b0.bin
c1886e3ba849d87d669a11301e9b03ca6cd22414d1dcd5e6467ae4173cdc7813
pdf-font-stream PDF embedded font (sfnt) at offset 0x114B0 10528 bytes