Malicious PDF — malware analysis report

Static analysis result for SHA-256 8deeb0d5fcf81288…

MALICIOUS

PDF

92.9 KB Created: 2021-07-25 19:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 814d3f000fa1ba84359e5aec311af3e3 SHA-1: d565d6f50c2d9c1a794b39da0e092ec2ef211d3d SHA-256: 8deeb0d5fcf81288973cb22b92f47ae362e058cf0194292078cd1578e5d220af
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests a lure to download other malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62ef9e2d1b---barabeno.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c09427441---80992680579.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/80151879205.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087a6ef0dce4---8847107911.pdf
    • http://boathousebrokerage.com/userfiles/file/musebipavefesozediba.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160efdae08236b---61233249054.pdf
    • https://cardion.dk/gfx/fckimages/file/zemega.pdf
    • http://www.contectrade.hu/fckfiles/file/23222702684.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0ab9994c2---19320496100.pdf
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/49103939618.pdf
    • http://sys-svinding.dk/userfiles/file/mobukaxejegoriti.pdf
    • https://hasekei.jp/userfiles/file/73876054464.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d69c36932---setez.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5ba75c10---jesuzego.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d8da4f4ee---77531614222.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/d72de295c19e9aa8ed8a5dadae62b9cc/56861120409.pdf
    • http://diamond6ranch.com/userfiles/file/fadetubaxurulopisixivuvud.pdf
    • https://cytairtool.com/test/userfiles/file/20210707_ff57a.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b0ebcb04d---dukawetodake.pdf
    • https://robert-zauer.cz/userfiles/file/nigepebukupetizokumabala.pdf
    • http://ggmtc.net/userfiles/files/89042932144.pdf
    • http://austria-ex.com/images/blog//file/relos.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab82a4f7f2---lorejabopizotabaf.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/73ff6f7b4f4fde71c807fb82ca919b36/rijugibokesajikizix.pdf
    • https://bosgo.mn/uploads/files/pasub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+murder+of+roger+ackroyd+pdf+free+download
    • 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_off0001057c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 16792 bytes
font_01_sfnt_off00011d8e.bin
cd6e8c96c7c1484ee5802fbf0699cf8815e30edfb192f657f5f05542f6ccf45a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 17796 bytes
font_02_sfnt_off00014b5b.bin
3315caa424dc0585aeeea8c60f4f4b7c2b5d0824c8bb259c68d39404967abed2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5B 11064 bytes