Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2fb053f553af5b…

MALICIOUS

PDF

82.4 KB Created: 2021-07-16 00:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9d437e058b91dea3f97e1601a9fa09fd SHA-1: 0bac9af8f110ec9a9068fa0b243323576c0c94ee SHA-256: ac2fb053f553af5b0b152d06fe9a92ae0b0e01385fdae59d91a6b175febb920c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged as a link farm pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=ce8703+structural+design+and+drawing+notes PDF link annotation
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fd60af21f---siwavaraveb.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/33247441179.pdfIn PDF document text
    • https://soechi.com/userfiles/file/26246428578.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/50204210776.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c114556148---49249845794.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/73735267961.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/13a86113e71a9473f9fa7bc594da6995/54125257722.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/tujasapoxezotavig.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/7059157604.pdfIn PDF document text
    • http://dakmet.pl/upload/muxogusudasovuzamebefu.pdfIn PDF document text
    • http://sireny.net/share/files/55388404721.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/madopofimunutafexoxarurug.pdfIn PDF document text
    • http://martonelektro.hu/files/file/xeboxipob.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d93e8369e32---xepujev.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/lexoga.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ee0a6df82---18463767083.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa0a2784a---70481128483.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/nexonudemokawamelopok.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/85745836687.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/88633491155.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2728728299---94570964565.pdfIn PDF document text
    • http://headrepublic.pl/images/files/46639157925.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f015972b67eebebaab5cbb0f4de39ccf/49622709681.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03ba9b2fc1---5595931059.pdfIn PDF document text
    • 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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 11312 bytes
SHA-256: 1910f2b54644d09ba5939a390c157bc7a34be2b1bc0c935efe82db4743fa3a24
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 17196 bytes
SHA-256: 1a1d0af03b0ef40178e78ed1005feb0f1b77954db254a1128cb419803fc966b0
font_02_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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