Malicious PDF — malware analysis report

Static analysis result for SHA-256 85361b96bdeaed2a…

MALICIOUS

PDF

87.2 KB Created: 2021-08-06 11:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 012e9693a9d5ae388b0cff8d51ee27ee SHA-1: 7195aa383df3a36b92b8180b627a76aeae309b54 SHA-256: 85361b96bdeaed2a3fed72223560fc5088f73f257066ed7fdd3b29e299a64f97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites, many of which host other PDF files. This suggests a link farm or redirection mechanism designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a59095bd3---xugumexiwedojazelurajo.pdf In PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a4ad701d5db---28780181490.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/ketijimexotexexatixiner.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e494886724967856a11157c619caa941/93856451006.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/wisomomunine.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/783d5aa8873fe29be17cd5aa327e488d/59188195462.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/65758945850.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16091a21ac7c06---82756383310.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/tazasisadisogiv.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/74819870180.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/lefuvojuw.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8hp4f211drvajvjvkff1jgh677/wavofarigetemetetugak.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6018e3a52---36768946258.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/boduvix.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/46187666249.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9980b550---24225775337.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/45610479808.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021063081826_459329649.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b258649efd8---39461687892.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160792d687c385---56477601651.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/witaju.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/34303021544.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b7a41fbb0---53125890648.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b24bc1b944a---rovebibozomavalalad.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbbbe5099e---wofifopajunego.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/79190718922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=manual+para+entender+el+juicio+de+amparo+campuzano+pdf+gratisPDF 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_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 17804 bytes
SHA-256: b5ca73ad23319116653871cead48b702daad8b74b56d4d3a88cbd01d9f7b8de1
font_01_sfnt_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 11244 bytes
SHA-256: 3f0b559bbd00c11e46270ece4c6226942f7ad72e44ca60244ebcf4d3901f1ebf
font_02_sfnt_off00013350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1