Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6656208a2143054…

MALICIOUS

PDF

67.8 KB Created: 2021-10-02 00:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a4ac119a58b9c3ec76a1945ad286a50 SHA-1: e0514ea25368289e203cdc7cdb8074dbc98be64e SHA-256: e6656208a2143054f91cc9b77d9aac3d804000f9d454fad00e66f9a6c5f3701a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, a common phishing tactic designed to trick users into clicking a link. Multiple heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a dropper or redirector for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://iqmuseum.mn/uploads/files/20033207946.pdf
    • http://etnorom.hu/pictures/68996730826.pdf
    • http://eskuvotoszkanaban.hu/editor_up/xukevudunipezifowoke.pdf
    • http://beming.com/ressource/site-image/files/56016463277.pdf
    • http://finpacecuador.com/userfiles/file/tezodalipudopetuf.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615781e2b917c---jinupexawox.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee27f244d---walerafataluragi.pdf
    • https://jf-orvalho.pt/userfiles/file/linumumum.pdf
    • https://anandamsanyal.com/userfiles/file/91085481675.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/67884568757.pdf
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/64936322669.pdf
    • http://microsolder.hu/userfiles/files/77033009861.pdf
    • http://gccde.com/downloads/blog/geust/files/mugujuke.pdf
    • https://lmcmanager.com/ckfinder/userfiles/files/62782641614.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614b844e5b20a---30666026233.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da32a73f5e---xedemerokamegaxomoxeze.pdf
    • http://myphamasia.net/upload/files/sarapitumaw.pdf
    • https://nhahangbienhaitien.com/uploads/files/lemelufevujopegitoro.pdf
    • https://queensflower.nl/clientfiles/47304181020.pdf
    • http://tageedesign.com/ssmpt/documents/file/popivilorewaxovadi.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/54528838218.pdf
    • https://mygoaltv.com/ipp/images/uploads/files/56038511609.pdf
    • https://armenia4d.com/contents/files/nevisuv.pdf
    • http://qunjl.com/userfiles/files/91248423708.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bangla+choti+69
    • 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_off0000ade1.bin
f0d3438a8984ff3e15f942a5509011688b71fed5d07d21717bd6ba89bcf08022
pdf-font-stream PDF embedded font (sfnt) at offset 0xADE1 10500 bytes
font_01_sfnt_off0000c5a2.bin
f6aadd3ea69f8f84f2d1cc906beee64efd6addd9c9f1d28c5542a94ef228e9e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A2 14044 bytes
font_02_sfnt_off0000e895.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 16792 bytes