Malicious PDF — malware analysis report

Static analysis result for SHA-256 94153aafac1f5f4b…

MALICIOUS

PDF

75.4 KB Created: 2021-09-17 16:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea495fef9c5b875d693b61ab199d98b4 SHA-1: 5b6519ae5a0186c5c79714c3e7397c7d15351f87 SHA-256: 94153aafac1f5f4b02862be6465c6003f956958bded89c578a36af9b8e65ebe4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many links pointing to potentially compromised CMS upload directories and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://deycaterers.com/ckfinder/userfiles/files/69717204518.pdf
    • https://tennis94.fr/img/pics/files/30412361284.pdf
    • http://mathrainbow.com/userfiles/file/17018846875.pdf
    • https://charlesstreetvideo.com/userfiles/file/telomejajenilalilegupelar.pdf
    • https://cemb.ca/upload/editor/file/6387288432.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/15253457374.pdf
    • http://1day2night.com/UserFiles/file/panatilevijezasafibu.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d94c71fcc---setedab.pdf
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/gumabasivebaw.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16136f9e43fb32---68506270615.pdf
    • https://imagebrandstudio.com/userfiles/file/resosupeje.pdf
    • http://abcgsgeds.friendship-match.com/upload/files/kugoji.pdf
    • http://falconfam.com/ckfinder/userfiles/files/85496566307.pdf
    • https://artistprasanna.com/userfiles/file/57878958247.pdf
    • https://schmitz.cz/res/file/78755749990.pdf
    • https://theelementrama9.com/userfiles/files/nudimiwenupuxowita.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3i5t86vth8098n3c2odn7g697g/pobukufobasijomudefulan.pdf
    • http://wxdyzs.com/userfiles/files/558405850.pdf
    • https://laplacedesstores.com/upload/file/rimanarelami.pdf
    • http://hyunsin.net/userfiles/file/toporema.pdf
    • http://www.ufolep-69.com/contenus/files/66984329433.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d95b8400---nifajuzemekawubuvabod.pdf
    • http://kasaitogo.com/uploads/files/gaxedetilon.pdf
    • http://ndc-group.ru/uploads/files/zalaxufozut.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/vozopesividubarovinowi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=aladdin+episode+438
    • 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_off0000c17f.bin
82c070128688c47ffb2709364dc26866e18ac27eb4aa134d72fdde511e8da248
pdf-font-stream PDF embedded font (sfnt) at offset 0xC17F 18100 bytes
font_01_sfnt_off0000f023.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 16792 bytes
font_02_sfnt_off0001083a.bin
b4538f48850b7a2cd72eb246ee49599db21f18b24785d191113df19a421a25a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 10624 bytes