Malicious PDF — malware analysis report

Static analysis result for SHA-256 135cdda24ff4673d…

MALICIOUS

PDF

72.0 KB Created: 2021-06-13 23:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 62dc45d1150a407002984a9827ebcea8 SHA-1: b6267812dfe411294f7ec015b677981c893be6a1 SHA-256: 135cdda24ff4673d7cbce5ddb52ea9e8be5f0c055eabd3510b1e25d0a6b9f617
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The document body, though heavily obfuscated, suggests a lure related to PDF conversion tools. The presence of multiple distinct hosts and the nature of the links indicate a link farm designed to redirect users to potentially malicious content, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/uplcv?utm_term=pdf+to+word+ocr+free+online+converter PDF link annotation
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1647e1b5---14945571749.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/madelejadarumoratevupofo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2abcb700f---jufoduzeremop.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/oh87md2p7ramhihof6hg817gm4/74146981396.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7277b40bce9d06185d9708b79db9dc1d/32175165521.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/9f3d57588d20b6ba98706d7fd562fc56/55589145956.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/torowefutitupizoned.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc8b03075d---gilidelululujib.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d02249cf1e---dugiderabiwirif.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/pewebovakobososisiref.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b710d556ae2---xoresokagawepevexufado.pdfIn PDF document text
    • https://empirepin.com/calisma2/files/uploads/81699282917.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/1c884cd5efc731e8f5878d80a0ca0452/52921740564.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/igo8th4sb2d1pstphgeo15etit/tutafetopujopupivolixez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 4780 bytes
SHA-256: 897363cd5b9471c74ca7e3be5b4bfd8e859d0711fd8853d9e1de6035e5473992
font_01_sfnt_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 11828 bytes
SHA-256: c077b2cdf57fa8b39051dff96ae69de15e016534ea8e81d930b91ee0b02c6898