Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdda7cac5e98219…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 05:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 26152bf2ede1e709151785b781626406 SHA-1: c6fd45d31b33aec8d3fbc25b80b64db585bcec44 SHA-256: bfdda7cac5e98219542a73437953ffd4f39a1675ebc8dc81d9022491c7c7c52a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which appear to be compromised websites hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to distribute malicious content through search engine optimization, while 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates the use of compromised content management systems for hosting. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=barron+gre+vocabulary+pdf+free+download PDF link annotation
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/62265666364.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/20543635574.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/64iq2goaiuh4u1gdss7q232ob6/gokolakepov.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161071257b4515---zadilojuxasogati.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/bbmuuvi1k8gpbsikahup9qkbo9/juniwibijubakawi.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/korumave.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210619_66F2287085BEA7F3.pdfIn PDF document text
    • http://ashioke.com/images/library/File/sogivul.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/37eu384tv4f8jbt4hm6gru8u2t/zakilomuzenotev.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/41459858700.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb8c8d6746---27634585848.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/koluxobab.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1a6eeab4f---tokebebukegegoradutad.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/31410566582.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/96008826848.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/3c23376dacbc7cfd7020e737069adfde/66974267481.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd6d90a60---tuxoxewideworuzetilip.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfc1517c30---10839326308.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/84596737142.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/vodumododex.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727a96f25c7---gezexitigixa.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/rltjk0cqlmvarjm91c3745bblg/71902210876.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/afbcd7c10c66bdafb7e8f34b32bc335a/85745637330.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_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 18540 bytes
SHA-256: b1f53f1b2a61aad34c8108a62936f4c1096f86aceab917cb9301385042003d4a
font_01_sfnt_off00010d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12537 10996 bytes
SHA-256: 3e2ba976f329709516c42ce6b4ec177cfda72f3a9fd35078f20846c68241a51c

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