Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ecf1ed90be6ce24…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 17:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f6a80a73bd958783ca155579cc0f5c31 SHA-1: 390298520ee7090b067dc2a3e8a844e8cbf90769 SHA-256: 9ecf1ed90be6ce24228075981c384c48d603f5d36aae6be717ad1756e7953b3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is a PDF document identified by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. These links likely serve as a link farm to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07002af87---jetobinixapizakat.pdf In PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac4ef46259---563798576.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6543c763efc83f228658a36eb30f456f/mexalededu.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/99838171133.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/41271795919.pdfIn PDF document text
    • http://osayit.com/images/file/25231711653.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/kesuripamuximinorovore.pdfIn PDF document text
    • https://tantecoccole016.it/file/fanopebisafemilol.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb215a83a63---24812623503.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/13350850598.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b00b3df413ed3410f847f0dafdbb4ecb/gogutatululorivagiji.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/82108511264.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608118ed3e578---wonomigex.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/larawitejakada.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/vnrk9k2g92s5f5o96el573n2b5/parulegarumivenubexofal.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/sopaxor.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/017bc06rputekibhtmkei8jo0v/woxizo.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/18487171810.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/dariduji.pdfIn PDF document text
    • http://rld-carbon.ru/file/3478144048.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/17501730288.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3ca5a67a1---88749738564.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608296bde73a8---nofire.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/6hndslofv47n7oo9m0flo4v43f/navifalajexetet.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/tugam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=radicalismo+liberal+pdfPDF 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_off0000bc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1B 16896 bytes
SHA-256: ae73c1562c839d72d93339c6f25a6354670731c95a5795910b2f0ebce81e4a99
font_01_sfnt_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 10764 bytes
SHA-256: f66251909b8630e6f127a983582c2736849e6ae19eeae741721622267736998e