Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba867f214732b8f…

MALICIOUS

PDF

90.4 KB Created: 2021-08-23 14:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7837049251e310df0e4763c8fb17b768 SHA-1: db05ba7fc664671c4ab7c1d2a25888a66793f938 SHA-256: 4ba867f214732b8f537d08e562b27c6309b7641e659d597903244883c41fad9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=class+6+ncert+science+question+answer PDF link annotation
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d93bae39c7db85e984413877b6b63420/28768653370.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/gapojumagijata.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/sefatejazobogokapuriwanu.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/dedobukivinubedar.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/lafonofakuribojajimibij.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d33928d32df---51535360258.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/gidis.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/67658251423.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3584813cfe53446a7dcbe4bb7f3c1984/xafudub.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b351631b39e---49977239568.pdfIn PDF document text
    • http://cartopack.com/Images/file/24095363775.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/61388377387.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/nabezim.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/zovizupinosevizad.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c7300b16259a9a346e383405c41474b7/teduxinabugetow.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/narafivofiposekog.pdfIn PDF document text
    • https://masukpt1.com/contents//files/garefofiwufimatutaku.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/239a5bfef2388dcc8f7fecdb79700fd0/bufukes.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/bimodavamenopegubo.pdfIn PDF document text
    • http://vswet.ru/f/vodawatugenufowugomizawu.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8c51614f---tiwakeduvipexeju.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/4hcpkg27lt20s4nvbcr108onn9/98531553128.pdfIn PDF document text
    • https://mnlex.it/file/laxejeg.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/70643837943.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606da22fea1e7---25342753220.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_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 16388 bytes
SHA-256: 4021d3fcb74c18ed19884ab7407f1e86a1fc3031db8bedb5313fa885ec9c42e8
font_01_sfnt_off00012ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DF 10752 bytes
SHA-256: 657137ec9afb8f073b9fa3cedc11f67348cca78597e246ac02d4a47faadb6499

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