Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a9d4df49b895dc…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 08:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5215f4e282927e27bd198043afc07cf4 SHA-1: 9f1800267e60702da00aa2c0c58c3dced6bfc1d2 SHA-256: 33a9d4df49b895dc6ca7e31705acbb22f2e7627a7f7fceeac2578dc439f5cb54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/10kikoknj84c0adb5k3581dtg5/figudul.pdf In PDF document text
    • https://laflammerouge.ch/userfiles/files/jolegodupefu.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/sl049c9ijfu5dt0cd47f1ig0j9/zejolimomuwanuvuba.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/tebemot.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/mumisogixapiwetubabadag.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/73461055995.pdfIn PDF document text
    • http://htygroup.com/upload/files/43757285215.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/2eb3028380025adb5f3fe2b8386d347c/88951776165.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/pusuvuwedowefitogiwedex.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/12393263251.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7445f820f2a40fb97d100afde27a7a49/leguwitamoxudipoku.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b43bd7d58c---41842960846.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/lezarosemowuvivamesenu.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/49028899424.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f5c3a648bb1cf9e06a073bfeae9c76e0/nomipewidovobemesajadesux.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f25984df736---16642771989.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/lolotirufivatemoxoma.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612654cc84ce0---gazofugisususazebib.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5976b41c3a---bunarisasopapilejaluve.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/72394477690.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/ponusib.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/32685771850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=social+systems+theory+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_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 10972 bytes
SHA-256: 622b1232f8bb29f41f1e14e94fc56dbac4acc56fefb754fcd9e7ad38b6d717da
font_01_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 16504 bytes
SHA-256: 221d336ad517f469d319361008942fb7cb069dbcdb9ed9f88985c0d229cfe447
font_02_sfnt_off00011dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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