Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0e85b01330d2cf…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 19:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc9cdd6c5f7139304ab0e71d6c94558c SHA-1: 10d1c2fb579bbf966a495309bf7a6bfef4965c2e SHA-256: ad0e85b01330d2cfdd66ecad896ac04ea982a69e59a7d0337db3728dd013743e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f134805bd7---26050738231.pdf In PDF document text
    • http://matchonusa.com/uploads/files/49019590146.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/xafujuzumufifapisigim.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ac692f8416c---94614844159.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/458487605.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/16821624806.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7d929131f29be053a567fe06c6f5b851/2842346427.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/28192744532.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/o4p13o266ae0pdqprd4giebcs5/ridetatifuminerepo.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/lemigemozalugaf.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4b65fb818417f44a5b867237cdd846c2/voviziberomitalapekob.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/95597774219.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161181d7a1279b---jabukivimuxutodopukuzipe.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/rimafuxatakiwoxijamemula.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/ziruramaw.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eefab4b6de---87617522363.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ff7722095---lepisakotod.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/lojokofij.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/a153c453096dce868bdea70b4e8fd254/suxudiwexebadevupilidulu.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210707_3E1139E80A178575.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/9467650938.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/kamefisaratixuso.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/937c8c8a4a2741ceefd3f22d29d4c41b/vonukunip.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/7158305979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=aztech+homeplug+av+manualPDF 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_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 10668 bytes
SHA-256: de4b8704353e60f8ec6d3979b386f0d306cc379934329e9c7b7db5b3cdee1675
font_01_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 17032 bytes
SHA-256: 9ed17b60be7b01192419b7013171599b227efe9c02282bb4ee8e2ccbe6b7f1b9
font_02_sfnt_off00012d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1