Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dcf2be827710ac…

MALICIOUS

PDF

89.3 KB Created: 2021-08-11 04:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e418eb925bef9d9db295f1b081a75e1b SHA-1: 1dc8de078b75d7be56936f6566884ff319558300 SHA-256: 83dcf2be827710ac6c8656ffb44471d34deb6605e23681b6b570e4b99cc7af4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading unwanted software. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading and executing additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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 https://ketchas.ru/uplcv?utm_term=dynamons+world+2+mod+apk+unlimited+money+download PDF link annotation
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895748ac2fe---zebimivajajukupo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b788397f8e0---torodezedegix.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc0cc1ec5---80309745368.pdfIn PDF document text
    • https://netpage.info/userfiles/file/kipaxezujuwizusewexifusup.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c7f56337ff453446f9d67bdc50349f99/36464975340.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/figixorituraror.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/7dd9dfc63ee26a28a24076f6b728b72d/jenenutonilagozomoruxa.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c272f050bf---fukovemefigasopakugamuli.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/lisonetulitik.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/xuwarewedigiwoboboda.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/jojikumavokonuruxatizedew.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/kususeb.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1dc8d463b---59895135014.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/84518391714.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210607010652_spwomb.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lotupagamanezi.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/o2h77lhio7ulg48hhi4bq348o7/dugararige.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa72c457a1c---farow.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/10436785961.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/60732307719.pdfIn PDF document text
    • https://esz.jp/img/editor/files/bejapajuzekugikijo.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/59019092570.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/06d7fd15c2040aa3f8e723194e730ee9/ruziritu.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/29793422719.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 11068 bytes
SHA-256: 589b4d983ad5acda46b4290f45530fc8ee6d9f5e1658f8d3bf310c27274f9124
font_02_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 17460 bytes
SHA-256: ec410c309b6b057c8c5e6d58a537d900394cc059488f8b2fd47127e3874fed8b