Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f7a4b69eed0790…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 21:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1584556ecff597dd57aa3c34f3fef55 SHA-1: 340aaea4b34a3f4782820ec2dcf7e4f11a8d9f1b SHA-256: 39f7a4b69eed0790511860abf84f5e4f7e6fa3b542f4d406f5632715d6c9d8e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pistant.ru/uplcv?utm_term=resnick+halliday+for+iit+jee+pdf PDF link annotation
    • https://998.geektic.com/geektic/files/gidimatutugofujuza.pdfIn PDF document text
    • http://atek-ent.com/upload/file/19361198362.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/19297488836.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/51409455560.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/66612690035.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9bdcf79c---52007888813.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/37656227846.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/82834047081.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/jinuvosexowaduvegozusume.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/luxabefipozupuzakuwa.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/tobeven.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210912152558.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/87159180669.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/reberubotolomono.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51f428eba---68546243055.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a968e32b6---16167192929.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zawifiweguvevifebumub.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/xolupaw.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/81647535145.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/39259485054.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/76333516826.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bf266f4e5f7ba1f30ad263d7c9bf1e03/jujokubotusafozave.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/kajefekowozuxuved.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/roxanorokatubulekexomokop.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/66360409073.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/11485683649.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/30294051740.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/vafuxurubemufakiwolad.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_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 11100 bytes
SHA-256: 9dac0d1a35331915ffd556a357e294180de20489078c8367a5878837de84fd41
font_01_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 18560 bytes
SHA-256: f273a70d5049a8b3aa0784bf393909e65d0ad339cb0e7ddd28d4b82020501c65
font_02_sfnt_off00013095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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