Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f89275fd2f7346e…

MALICIOUS

PDF

84.2 KB Created: 2021-07-05 00:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 042d162012ef5f3bf85932e6c7577228 SHA-1: ab32993072b56fdb78b66032d1f1a0126e9ead6a SHA-256: 1f89275fd2f7346e93bd5519f788ae2d8633b010ec843d5c588e3250128d9788
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the malicious nature indicated by the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nmglyxx.com/userfiles/file/25120378069.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d22ae1781---xonozoxizuvenalevib.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a37ad116---taxefewasimobagana.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091e7743c98b---meminixasenovipuxogulixa.pdf
    • http://timavoshipsupply.it/userfiles/file/17834357292.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090f1fbe0ebd---33676347108.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb802e67a1---619275753.pdf
    • https://villatoscana-pi.it/userfiles/file/revibirilurut.pdf
    • http://amirafouad.com/uploaded_files/file/mabeluzizurogone.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffc005fbd9---27552039987.pdf
    • http://udokutscher.de/gfx/userfiles/files/30432237222.pdf
    • http://joewhitefamilysite.com/clients/59967/File/bifogopubisigojefowevos.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3edcde224b82f03c834fe7d94e9b24f1/patisezigenuja.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/64207451819.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hn89k2lbfhcdapaj0lcsg2easn/726916347.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/76hdmol55lot00q2u3pnp1uqe1/33809882284.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/8ddc82f269517c1d67f430ec7b0f861b/34953832044.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/831873b4ed28ce0e35e092b04fb2cc61/rupazebosexuk.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7q2c3ptnd9lhb9qc707pv3aja4/wogefo.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d641ac0811a---42590226499.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7384d9343---80514684608.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=risser+sign+age
    • 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_off0000e886.bin
4923c556a071549aef713920b06f2646637246aa01159f22d8b6df1cd6dd240a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 10064 bytes
font_01_sfnt_off0000fefc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 16792 bytes
font_02_sfnt_off0001170e.bin
c253a2907ee8d3137b6b78b0dcd2dc759c3970212c4830f46ae908fc1c9d2b13
pdf-font-stream PDF embedded font (sfnt) at offset 0x1170E 17216 bytes