Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05340df68e9771e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 19:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0888d567b9d665cb1b315fd75f1d7a4b SHA-1: e7bfee2aac767d9f42b9f0ea211921b03fb51ff7 SHA-256: f05340df68e9771ef0a25650a74b20cea387c280347a0a5af4b3e457bf031f33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://oticonshop.com/ckfinder/userfiles/files/noxovepasanitulirugiwuruv.pdf In PDF document text
    • https://netlandschool.cl/files/81518542744.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0d1349e95418c14a7361adc3161ab396/73070467743.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/47288117724.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/29031829421.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/uqdr9jh6o0rsacpfsc4akc3466/jaberovixisitesem.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/enhats6jcb52e8q6n3g0dondg7/soribebovoporetaxejuzaxa.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/43225506169.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/77162635069.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///papatodisul.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210822_40C90F2806C8EBAD.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/murutolukigowuzod.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/61162106792.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcf2c5a106---234003309.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/33761352048.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/nazidevekomejupekutur.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160834b0ccca51---fesodusibinuliwisewoxojis.pdfIn PDF document text
    • http://atomleasing.ru/media/File/20636635007.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/46980499622.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e9ae20a796cdbff786f785547826e16e/dimit.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/mizuv.pdfIn PDF document text
    • http://tianfonmm.com/d/files/50155873966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cardi+and+saweetiePDF 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_off0000d546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD546 19680 bytes
SHA-256: 76bb24890602f8ee3f20c60c771ba321162446222b8b52c922d6aa3bd8e02700
font_01_sfnt_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001213f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 10192 bytes
SHA-256: 11ce6f654979ad326531ad7ebb990e0348b7a895040c8d5a343789333329d659

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