Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f689fd92dd0b8fd…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 03:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2aafee71b70dccdd7cc372cbc09bcca0 SHA-1: 99b94ff13b555f18e408f7f22bf59bdbf1b4f757 SHA-256: 5f689fd92dd0b8fdfe5501ed426ceb269c927e0ce670cdfb254ad2176ed07499
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. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of embedded PDF URIs and the general structure are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=my+babies+are+my+world
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7728210ae3---jifuvebubazen.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20b031c06.pdf
    • http://driver-jazda.pl/upload/file/bofabo.pdf
    • http://www.darvidproperty.com/news/file/6777139330.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160845720e4520---fuwisinodupeful.pdf
    • http://divodizain.ru/ckfinder/userfiles/files/78614455065.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb1faef092---61154397549.pdf
    • https://eventpro-kontraktorpameran.com/uploaded/files/ruvamiloxa.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/59f4ef35a31e78eecbfc36b747c20670/31900072780.pdf
    • http://klubalfa.org/img/userfiles/file/28491601221.pdf
    • http://tlxzkj.com/uploads/file/220745287165.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74932985e---66308750801.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/187nhcsqaas5ol6su59hliu3s3/52352408593.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/21bbfef650797c1e11adb970943a2a6b/3714598950.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/93ad1267eb92825bdb5b6db68e53797d/fimotupifujat.pdf
    • http://knowleangling.co.uk/ckfinder/userfiles/files/gijotebigapatare.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611034363e780---50788145926.pdf
    • http://dailitara.lt/bites/uploads/file/mefetasamerunatutoxub.pdf
    • https://noihoithanhtuan.com/media/ftp/file/nujudazagu.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c53e3b92bc---mutileguzewamo.pdf
    • http://brandnewgoods.net/userfiles/file/dibisetabafusu.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160750cb2b4679---vugunejonu.pdf
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/menaxumuluxukuzigileb.pdf
    • http://seanmore.com/userData/board/file/34089893724.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a03b3ccca---43289806079.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e105.bin
4d4e1ac1afac81ca71da66561ddabf5f2338f400df675853a09685d0e2ac9e9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 17740 bytes
font_01_sfnt_off00010e6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 16792 bytes
font_02_sfnt_off00012682.bin
01a37da8766d8c3939a89a3dd8b141eca661cbd5a62ffe09f765d0f7d0ff4916
pdf-font-stream PDF embedded font (sfnt) at offset 0x12682 10540 bytes