Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffe7cbffa2a6108…

MALICIOUS

PDF

75.5 KB Created: 2021-10-11 05:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0c60c907136a068d4651ad2230e91f1 SHA-1: 8189eb56ea978e5d62552e2e36075ee03a24cac1 SHA-256: cffe7cbffa2a6108e96a4b17c57034cf933b16d09e01d57b0ba294f49891475e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://bestcaps99.com/ckfinder/userfiles/files/88528011096.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/o2j6c75bf2npsn3fmrivhant43/39484525693.pdf
    • https://damiel.eu/userfiles/file/58373975972.pdf
    • https://jewfri.kr/files/image/files/54904188538.pdf
    • http://candientushinko.com/images/file/33172810345.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161610362a9923---nafosujatu.pdf
    • https://euronuts2009.ge/files/files/wubezetozebe.pdf
    • http://archpiudue.com/userfiles/files/56413075129.pdf
    • http://rubivina.com/Images_upload/files/90886102808.pdf
    • http://heichapuzi.com/uploadfile/file/torevixopafi.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/lipujogorugevabakezem.pdf
    • https://cfaegaianascente.pt/portal/userfiles/files/82669348094.pdf
    • https://elminhaj.org/userfiles/file/medit.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/roluponosoperize.pdf
    • http://fatename.com/uploads/files/202109231350569020.pdf
    • http://patrick-vallot.com/upload/files/mirijubavafaxuwir.pdf
    • https://funke.be/data/file/76141783078.pdf
    • http://konberdbio.com/upload/files/53161657536.pdf
    • http://hodori247.com/uploads/files/ponumafelokejosev.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/19d141de1dfc75231d4c8dac642570fb/13301624640.pdf
    • http://robalton.es/Albums/images/file///40735418248.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615756b92b638---xisalo.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd7d5d519---repogobigupa.pdf
    • http://laser-piskovani.cz/democms/userfiles/file/wurefururirufiduwopixe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fangirl+rainbow+rowell+read+online
    • 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_off0000c356.bin
108c3d1fa33fef12a8b64578fe5eaf6a9feece6b32fbf546df79c20b4b1fd02a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC356 10360 bytes
font_01_sfnt_off0000daa2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA2 16792 bytes
font_02_sfnt_off0000f2b4.bin
c3be062205d1e13b2b3ffd9c82a35618fa795953cda4ec7f628cec5b95dec35c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 17592 bytes