Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cf70d427085e1e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 16:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3625a4c1f79acf9e03f4adc1a988f13 SHA-1: 716db4d8db7120cd7b680983852d8ff505b7a2d0 SHA-256: 38cf70d427085e1e9c190ff00dde99cea42fca42a3bce7f596e98a1606615b63
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to obfuscate malicious content or redirect users to malicious sites. Heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://caratow.eu/userfiles/file/52592065839.pdf In PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/94423736177.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/makepaxejinemegub.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/sorujenifiputedefuvotata.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/38778168652.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/20422477746.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/kexugumubebuxopitadude.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/31917155969.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a0733503a8a---87497792395.pdfIn PDF document text
    • http://serting.eu/userfiles/files/70470771545.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/at2j9c9gr6c73bcobcipgm9fl5/19129120951.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/76166608997.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/24152833253.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7704c5c70---17569332883.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/92261951755.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0cc6765abb5af360383ba36fb51eda91/xosibelafifupagulemige.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7577f7755f773533108abc7e97166d8e/39670218293.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/60581415341.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/e4bcc9bdcbcefd3b14c65fe1e8560d06/rexegapizukirefibedamufom.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a07853fe11dafe2ed03c4dca263d6c22/8582359690.pdfIn PDF document text
    • http://digifast.cz/userfiles/45057214279.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/xuwut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=it6004+software+testing+pdf+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 18444 bytes
SHA-256: 5af4940b8c7f6a0838e4bf0f9c477e10b3262115b1a5b1a7fd74ede12af59bba
font_02_sfnt_off00012254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12254 11080 bytes
SHA-256: 8b4681dc4677a192afde69455b5eea10d182e96769c9db4e324ffa359e597540

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