Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a90961e0e844ca…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 21:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95e09b0875e4b6fe5637f2ac0493a4e2 SHA-1: c2b46aeddef3fa3ea7ac8a9c3ec3528d7a2c593e SHA-256: f4a90961e0e844ca705586693801d9007df31477883a95ede2bebb7b24dde3d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce194ac85---rijojizomaligu.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdfbf8c3ba---39033372673.pdf
    • https://foodsafebox.com/ckfinder/userfiles/files/65878336277.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442b04e9953---tofabexikuvosiboze.pdf
    • http://shipsupply.ru/userfiles/files/26250820353.pdf
    • https://alaqart.atelierleuthold.ch/userfiles/files/xesexajudojipupeg.pdf
    • https://dmshospital.com/mm_engg/files/bekolukijuviwiw.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142d04b01bf4---famefabipogobesi.pdf
    • http://nprofit.hk/userfiles/fasapoxu.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49250664956.pdf
    • http://poketomecam.com/uploads/files/60458212470.pdf
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/sexukirizow.pdf
    • http://xtra360.net/campannas/file/zudejotibog.pdf
    • https://rajnnuhiddje.se/userfiles/file/zukulukumumivuxomuxele.pdf
    • http://thanhnhomdinhhinh.net/uploads/files/wesiwanukuvotovipewax.pdf
    • https://cahayaapi1.com/contents/files/24644087853.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/71ev7e6n3pnodh3of6kql8jjtv/binowowup.pdf
    • http://dija.lv/public/userfiles/file/45029102390.pdf
    • http://p-itos.net/admin/userfile/image/file/1976148585.pdf
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/59009699615.pdf
    • https://ashleymongolia.mn/uploads/files/kavanopexekudalafuwi.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dpbtaqsuitmbndib6b7iljqa54/5972001220.pdf
    • https://stw-nowogard.pl/download/file/83368235811.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/54618314819.pdf
    • https://jatransfer.com/userfiles/file/pevijolidoxili.pdf
    • https://www.andreivieru.com/ckfinder/userfiles/files/nasudub.pdf
    • https://frontivo.ro/userfiles/file/90405006454.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=graphical+representation+of+trigonometric+functions
    • 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_off0000e08d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 16792 bytes
font_01_sfnt_off0000f8a4.bin
21e0d9931efedc1a479e072c840247c784c140d8a5b4ff02b81bcd778f5e55e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 11064 bytes
font_02_sfnt_off00011245.bin
6b1401d15d370b360e2547fbda8af7d4f5da195c9b1ba0ebce6c631ae804de5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11245 19012 bytes