Malicious PDF — malware analysis report

Static analysis result for SHA-256 f756d0e2854e321a…

MALICIOUS

PDF

93.4 KB Created: 2021-09-10 22:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ec0a1ef20d5b64b190f2c7717d5dd35 SHA-1: d9bff8558b2dcfd9626d744607ebc7f54d1be06a SHA-256: f756d0e2854e321a89fe263a709707ec6eeadae99dade36b7e960312b7f7f36f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm, likely used for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, possibly phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tucholainfo.pl/userfiles/file/5760624940.pdf In PDF document text
    • https://eletmodguru.hu/files/files/64429933405.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161394b744f948---65386211724.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/50567023226.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/lifotedawexazetedi.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/tivagazolewaw.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/tetosufuw.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/pelab.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/timadubevirejaweze.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/satixijabodamu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c2aac90be1b600c88ce0cd0b5b3797a0/tavuriviji.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/33461373981.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/95006637398.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/zeladolavapajut.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/23341963737.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210903153210692040nbby5m.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9fb3d591c---34830428976.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/kovesesuwofod.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/vivijezujaluwunugobixofo.pdfIn PDF document text
    • http://safetruck.gr/images/file/rapubaluzinigevulipejiba.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/11071063642.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/tabuvupetapejaxu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307b0208491---39879974989.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f4a0cf5ec0bba47649443e939f0274dc/78713006979.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/95059881358.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136819f56ffe---99884243179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=voice+transformer+app+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 10704 bytes
SHA-256: 7719fc1f0da764a4bf1025e679b4b73413dafd72229f0c447bd3b6c0d558e7ab
font_02_sfnt_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 17408 bytes
SHA-256: ce20a0082c295dbb9cf431cc8a6b623d5454885ba69a0d5220cb1c1c8853515c
font_03_sfnt_off00014bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB5 17924 bytes
SHA-256: 36aabd6d641be72d162cb6f9fca3994aa2aaf31f0857c97dd8ba48950ba69f3c

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