Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a968b6b894f1b4…

MALICIOUS

PDF

90.5 KB Created: 2021-08-08 11:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd91ae53052fd567146a2a8a329e1ece SHA-1: 5b600e4d68c4c7edf0d717e766295864e138896a SHA-256: 91a968b6b894f1b4eebbdf76868cf3583dd2b93e31fb49331807f6ff2b6f641b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or malware distribution campaign. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f08a01b21---lexojosojugatapuvuxonexu.pdf In PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5a13d11b98c7d7aaed21b9ffc80c92d5/61867046929.pdfIn PDF document text
    • http://jngf.cn/files/file/fazefu.pdfIn PDF document text
    • https://everestart.com/images/stories/file/14881604074.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/4fab9b073bd42fd72dd0bda9a240a7a5/88903525466.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e7d0332a4ed8472a63d33f7ef17b05cd/nivitojipuwuwofiwufigaz.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/degipupur.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dc204f2d3---44591610090.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/9483524900.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb946be3a7---sazipon.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/gekemexatazobotol.pdfIn PDF document text
    • http://chinalabware.es/d/files/nukexifi.pdfIn PDF document text
    • http://ekotronic.eu/files/file/89432262901.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f03b750d6c5---sukorekiwofeke.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/karofujuri.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/3leqab0itfl0r45qd0jfm9qh70/75385693010.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/dbqi0sukujg75gsgvstuqkpnd9/52220464843.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/jebed.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vewanutavof.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e461cb6decc8b0b59ad046ec9fc3c0e1/lafenerezizisubosikukuki.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6135ddbed4ec252141159b1cd93ab89/62716508415.pdfIn PDF document text
    • http://fitviewer.de/files/file/20577557750.pdfIn PDF document text
    • https://aneri12.cz/res/file/kukodawuzuguma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gta+v+psp+romsmaniaPDF 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_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 10340 bytes
SHA-256: fd283810ba7c8231fb26d95e8bce0d3c54467179ca18eef00ce9247cc127d6b7
font_01_sfnt_off00011487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11487 18560 bytes
SHA-256: 7ac199ee27d8850920f51c0c3086cffa5b46eb6eca3b81be8aeda865c913c253
font_02_sfnt_off00014438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1