Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd580aef1faa5608…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 19:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69757e576281d490676ae102ba8ffe83 SHA-1: 94f5fb03a6f61210651a75a73ccd2c4cfa7eff95 SHA-256: fd580aef1faa560847a6c3ccd2ace7ab1088723abed1600446502b6880f9f8e3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it is a password-protected archive lure, a common tactic to bypass gateway security. The embedded URLs, while some are benign, point to compromised or disposable hosting, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://retroldn.com/userfiles/file/zezupo.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/80502640665.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/pudotabi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1bea0565---gugirab.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/43307300553.pdfIn PDF document text
    • https://mauspro.net/upload/files/75493158590.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/805484667.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/78039249096.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/10866352790.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/tofafisoxos.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/3160736974.pdfIn PDF document text
    • https://fond.ru/userfiles/file/wapetajogiwe.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/13202874543.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/69614123803.pdfIn PDF document text
    • http://katela.net/userData/board/file/nafigobukirijepukafo.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/koxerotuwid.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/2109100158112406573cceo.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161303e7ca2dd9---xuginarajapesomeb.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/15086681238.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/98336417658.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/bamadurabogikudatemir.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/gusam.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/51318815757.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eece614735---naxagezakid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+crack+rar+file+password+in+androidPDF 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://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_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 10784 bytes
SHA-256: eaf9b76c2753178a3439c4a2ffe4c456f01f33fcc03b5acd8f8792e33d6441aa
font_02_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 18760 bytes
SHA-256: 57f8f5bbbaf009683859341dc04cc318e374323f6636fbeb9a864d0fe25b07be