Malicious PDF — malware analysis report

Static analysis result for SHA-256 239856b7e0b843a3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 09:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ec2b63bbaad0c119c7141372c89ecbba SHA-1: ef2f3e6293db73960847e3ab5822e0781f8578d4 SHA-256: 239856b7e0b843a3ac8db0f5b53562db9dd8c1133b5ceebeccacfa7aa775cc2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://elma1.ru/!upload/files/53080613640.pdf In PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/pagerofogike.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/disoguke.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/delepubi.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/fivonij.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/vubazatofewejijugafola.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/48964127705.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/46060419618.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/63959105618.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/2fbd25172d9505cb4e78622d30f7a00a/53180171293.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/9071454834.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/14869115156.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/58290882438.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f07f11395a6dc65f8d2f928bd0781772/43439795642.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/94563387125.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/mirol.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/79568865151.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/lepupaz.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/39511799261.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/dalipulujenepafo.pdfIn PDF document text
    • http://wernitznigg.at/files/feziwovo.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/pilowesisixivu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f058dad6c6---lijenerafizajavo.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/nabakofojid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+take+a+screenshot+on+a+samsung+j7PDF 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_off0000d713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 17844 bytes
SHA-256: 8e8ccd991bacbef6ead0b4e95b0d04e0f103e92587bf2b2ea463fdc9665d36b9
font_01_sfnt_off000104e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E5 11240 bytes
SHA-256: 94fd77803492498338fd44b5169314529293eb4537fca31a60079f2d63a5d555
font_02_sfnt_off00011efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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