Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a9bf232056bb53…

MALICIOUS

PDF

81.2 KB Created: 2021-08-21 11:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0243c26041e05258ca4a4ff5e2bd216a SHA-1: 7f09d02269027bc891aa0144f83ed42dce60ba86 SHA-256: b3a9bf232056bb53906adc09d94f93c12662bf68df3750e824f125e968c28520
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608479a415cff---47754396681.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/97267f3750bdb859bc4b72d2eff1cee6/34384849451.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee64ca226---jezokugezemunemutifu.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/soral.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c83242f156cefa03afbc913d1f9c4b53/gazowipeb.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/sazixerilepus.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/i0hm9omjjv6ucasgg79tig8cbu/48176178127.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/14734310772.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cfd6da889---sopedajovotuxoxuba.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/72425692276.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/51580602370.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822d6d58b31---49676911548.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/mubukigutuxamisosaz.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93fc2b48e7---63803610366.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210715/2212335462.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-1/20210701053730509431.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/sabavixubu.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/36558906947.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/feveroxiwumenofepusotof.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/fovajejedew.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/62557772914.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924ed933adf---70676615736.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c509b71b9bb---80380574400.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/82833683036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=dometic+rm2652+upper+control+boardPDF 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_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 17880 bytes
SHA-256: 8db79c951526c3f80070972ceda92c14521c67ba501463dc3d9dcc04de6c2263
font_02_sfnt_off00011d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D63 11172 bytes
SHA-256: 47bf133ab96ee1cce9d8f04878502d61e5be843313736c0dc22c4e8ac556491b

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