Malicious PDF — malware analysis report

Static analysis result for SHA-256 318a24d17d2cf8ba…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 18:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dfd2af9c284d2585f6815e855a07e04 SHA-1: 8246fe7d0e8064364d4226910dd8f6fb749785d8 SHA-256: 318a24d17d2cf8ba13dc765dea9640cce190474209ee662387065c19a5a8f8df
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware, leveraging user interaction with the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2vrbpn3kqi2099u68mlr5a4ni6/17908975339.pdf
    • http://seychelles-resort.com/images/blog/file/jalogemuvefot.pdf
    • http://razaviota.ir/basefile/razaviotair/files/73793960499.pdf
    • https://egyseg.eu/ckfinder/userfiles/files/vanexesugase.pdf
    • https://www.prshots.com/ckfinder/userfiles/files/57010234336.pdf
    • http://kowel.com/ckfinder/userfiles/files/1631819704.pdf
    • https://saikekanglun.com/filespath/files/20210911203357.pdf
    • https://banghenails.com/upload/file/22084506061.pdf
    • https://davnosti.ru/upload/87750012797.pdf
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/zotedotisogobuzavuvo.pdf
    • http://evevoyance.fr/adh/.-/file/kewoxerubakalefuguv.pdf
    • http://www.chp.pl/ckfinder/userfiles/files/47269393983.pdf
    • https://hunglivet.com/uploads/files/202109021256291366.pdf
    • http://group-anons.ru/userfiles/files/67815486242.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec84e838c4---68255356815.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161311e8105d51---21531765163.pdf
    • https://fenicia.uy/fenicia.com.uy/uploads/files/ridurako.pdf
    • http://demirlermetal.com/resimler/files/29038174628.pdf
    • http://upnbkk.com/file_media/file_image/file/fijimoturesabado.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/88728a358499eba7b229c5bc1f984a21/garofimikasoxenenukan.pdf
    • http://skia22.ru/pic/file/rebitobodafopav.pdf
    • http://stefanourso.com/public/userfiles/file/galiwanemak.pdf
    • http://pilot-market.ru/new/files/file/vopurabodawizokujafebu.pdf
    • http://pensionpoint.cz/userfiles/files/buxopoxavarejo.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132be2bdc499---70021414733.pdf
    • http://bearings-home.com/userfiles/file/kelenivinuwepiparijez.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+i+see+screen+time+on+android
    • 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_off0000e042.bin
ec7c74adc2f05c55c386d7b516b7b0c76df14a9c76592bba139ed00939c0d067
pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 10560 bytes
font_01_sfnt_off0000f859.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 16792 bytes
font_02_sfnt_off0001106b.bin
25eb9bf0f44a2ffba12c997d294c52c9e4ca52fea8c8a606f018f7c9a070a7dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1106B 17944 bytes