Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22d9245f27037df…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 05:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 969ed58f720add79d9dbc4367e4656db SHA-1: 0d786b5bccc3481ffbe1fd6223929bba6d4f1f00 SHA-256: d22d9245f27037df93c4054202492c4c7ed122c8959b2102b3b42c53a2d4a89e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, forming a link farm. Heuristics indicate this is a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/79506859145.pdf In PDF document text
    • https://west-holding.com/userfiles/file/fejujagikinodevunusuro.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/wereruvudet.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/98681545413.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/zaxogizawibadurejavexo.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/vuvazoxatuxazok.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/pozasuwawutivepatisu.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/39459339695.pdfIn PDF document text
    • https://betsin.org/userfiles/files/wuxetope.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/daviwiborirolaxevuwi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad9b2ef03---43514460929.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/83884382156.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/98590809836.pdfIn PDF document text
    • https://siroyensao.com/upload/files/vuvagumugovulobixiw.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/lidenofilinugaworuwu.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/tebonepemedeket.pdfIn PDF document text
    • http://moneymaker-gold.de/files/tumuxamepipik.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/59542680379.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/niwakagikuzi.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/baragufop.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/pezixe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613880c39bfb9---wugapopawixavupovad.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/f2ff22963e36a58da4911c836df5f4b8/pawep.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/fisizofesexiraluranez.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/39568433552.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/vavovazex.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/laxelunewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=open+my+sms+appPDF 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_off0000b628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3F 10096 bytes
SHA-256: a52d9213cb7eead27a873bbbea504064eb3f3b9b94756902e9f7174a9f5d756a
font_02_sfnt_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 17816 bytes
SHA-256: ed3a6485cd5f6f8c702729d3aef99e74491620efe5e6805c7ddf055afc687ff6

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