Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da8c37e5838dd9e…

MALICIOUS

PDF

80.0 KB Created: 2021-10-13 01:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f058ea83d9308832d2703436adfc4f1e SHA-1: 55cab77e343e58bc2231220a55e1daa660398472 SHA-256: 3da8c37e5838dd9ed733072a0ee30003dba2a3acba8cda7e11ee80251f2135d6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ab4e05d2c8---95098162413.pdf
    • http://miminku2.com/contents/files/mijisaronim.pdf
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/24936863467.pdf
    • https://ptogel1.com/contents/files/50350263538.pdf
    • http://bandwidth.aryanpalace.com/userfiles/file/70087432385.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/5ee62a47207e9c777dea429c5318074d/vudonesubilinamusetas.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161619cde4ea72---kedodukug.pdf
    • https://silverbirdmarketing.com/pages/images/file/reserajiwukamagi.pdf
    • https://its-bulgaria.bg/files/file/46320338583.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160c26bba1b2---26535566731.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615867302b0fc---19154461144.pdf
    • https://soudureornementalelauziere.com/upload/editor/file/ruvijiginojakurulixe.pdf
    • https://tutorbolivia.com/userfiles/file/91644395308.pdf
    • http://angelofthewinds.net/ckfinder/userfiles/files/24704689344.pdf
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/7678460715.pdf
    • http://cl-metalparts.com/d/files/ketululomalivejumelaku.pdf
    • http://www.valaisconsulting.ch/file/80818680835.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/xumiles.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210924060711.pdf
    • https://tunapvietnam.thietbiotoviet.com/Images_upload/files/kofamaku.pdf
    • http://feminella.ro/upload/fck/vujedidat.pdf
    • http://uzmansporzeminkaplama.com/resimler/files/62571390878.pdf
    • http://feedproxy.google.com/~r/Xvkpad/~3/RC0zOYPQW8A/uplcv?utm_term=canoscan+lide+100+scan+to+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_off0000d493.bin
de2e4473b87accbc8777063aee18666adf23448b8c2f869c1ace79b65141c1e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 10716 bytes
font_01_sfnt_off0000ed5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 16792 bytes
font_02_sfnt_off00010570.bin
051bc9b9bbd163771e00cfeaed2d73210aaeb4fc2c9848a3a907c78e11097134
pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 17216 bytes