Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94636d3dda2a9f4…

MALICIOUS

PDF

88.5 KB Created: 2021-07-26 04:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f50c128189dbfce4e9cdf7b022612a72 SHA-1: 5459d06dd0779ce7c29bd86b2cb9a398184993d8 SHA-256: e94636d3dda2a9f4278f68eeed6c0a1e33e3f7a125d6e0112f25c8eb051d196f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These links are likely intended to lure users to malicious or phishing websites. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/fc8211898ff3147786859dec48ac0818/pujederikova.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b3a3cb18784371de916f128ff5e84bba/37601237568.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/xutetanexorokexope.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/fonaxinadikotovumufagu.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f7ae179c1927a0cb2670559ec327d6fe/zowuwi.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/52189523098.pdfIn PDF document text
    • https://campermagazine.tv/public/file/13328421388.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/3786eda88aae58b8df2e1b3177609793/14602793770.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/gorunilopatepidog.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/nuxusemorilekejuzasabu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097cdd2898a5---71455271492.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/26394488632.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/26392258638.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/feweboxaziwizavu.pdfIn PDF document text
    • http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/88539997308.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/693957ef31d444f4e3d35bd75d5db19a/5647397300.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/e4f5269bbb7be9bb5c40d53e23a352ff/womipekasaboxa.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cab4555d49---mupifimaj.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/22687750586.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc88572b1---nuliviw.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106290124.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65764a3fe8---kimawabas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=disney+cello+sheet+music+pdfPDF 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_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 17240 bytes
SHA-256: 888759d347a61c50e297d359fa3cbc5a369a3124835ed7a1f0b3bb51b4f77795
font_02_sfnt_off00013adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADF 10840 bytes
SHA-256: df983e10cc7306ce001c3ab59a45c427f43bcbdd1ac48486f06023d039e51620