Malicious PDF — malware analysis report

Static analysis result for SHA-256 9430b6ab9fac7506…

MALICIOUS

PDF

101.0 KB Created: 2021-06-26 16:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84845df5fc92cf22d67b95d684cc3a80 SHA-1: a0b72f16cfaaf02bcd525f5f549d8edb79b6e0ed SHA-256: 9430b6ab9fac75062857c2df344fc34e834bbb42986b2ba5d36b1f3e20f700b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm, combined with the nature of the linked URLs, points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://yildizwebpaket.com/calisma2/files/uploads/80494811665.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3a99d3fd7f6724c9a4be7144bea32cab/jevapidisigamufabilu.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff9b3d7582---wuxevuwalikise.pdf
    • https://malashealthcare.com/userfiles/files/65150881064.pdf
    • http://alexhoffordphotography.com/temp/files/file/66728046500.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/e905c87c3c90af8f1e5f3aabf969fbf1/26153015333.pdf
    • http://urbancollab.com/userfiles/Proj_Name//files/90781407260.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/18231006359.pdf
    • http://bakoca.hu/files/file/komozemivawev.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/n20dsbp21qpnn0gbo97dmov117/33839583963.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a14153a9d3f---95204128980.pdf
    • http://zrdb-drogbud.pl/Upload/file/xelokilusase.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34799f8a0---nivonusowifexiladabonis.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160798a67e1b00---65417673767.pdf
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/70263295108.pdf
    • https://implant-drill.com/userfiles/file/57501929902.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/uksr90iguk3i6invu848a5plj7/23182694494.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d40c8334543422cedb99ba5e8e1bf7b4/dapufiduzob.pdf
    • http://atut-biuro.com/uploaded/file/33169391335.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/fedoxuzipopulinelewilu.pdf
    • https://dbjadow.pl/attachments/file/jelomilevixoximafopiwipu.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fc358d4eb---memupulojurorapave.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/9hcqdhe4i12o9vti01mae5ritl/73347201212.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=manual+regression+testing+template
    • 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_off00012900.bin
4c90b4efe8b1ba001a95667c569a9cd0ab5263d0c6f2e5ddfb05b0fec0fd3cfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 10688 bytes
font_01_sfnt_off0001417e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1417E 16792 bytes
font_02_sfnt_off00015990.bin
49aaa51ee08de47bfac860e9c488bb63456ef810bd39bdbbbe1a428a85660eb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x15990 17268 bytes