Malicious PDF — malware analysis report

Static analysis result for SHA-256 56db11db6a3b58bb…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 16:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8f3bb31ac7f7f0418462ec760cdca0e6 SHA-1: 3266a0aa6b351fb8e71b58a17b3c1f1e4617761c SHA-256: 56db11db6a3b58bbfb2727ef39d874ea7b9c942b3860e1c487b37628d12d640a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, including one that hosts a PDF with a 'fifa street mobile apk' UTM term. This suggests a phishing attempt to lure users into downloading potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ketchas.ru/uplcv?utm_term=fifa+street+mobile+apk PDF link annotation
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614211e9358c9---12117293466.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/jumetaxivudetoremaf.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/81850856125.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210901134443_386847865.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/wipoterevuzomuvevawa.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/21579688738.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210904/files/20210904043551.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/sipafefatebutaduwu.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/ravisujezup.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/61605139415.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/zodupidag.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/verofaxufesenewutaba.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/49112825178.pdfIn PDF document text
    • http://m2m2design.com/userfiles/mizumevudokewijusiwokem.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/52910967785.pdfIn PDF document text
    • http://maksimetall.ru/files/81392218328.pdfIn PDF document text
    • https://sergiomauri.com/images/file/90394061281.pdfIn PDF document text
    • http://e-district.org/userfiles/file/tadirunu.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/9805299849.pdfIn PDF document text
    • http://chayka-svg.ru/files/wetonebagunapowos.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7478b4abe8ef1ff8f7df53069ccca5fc/42890371568.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130c17da0a8f---matonubukiwixiful.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/jixominagotaf.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/18f93dad593899bed546078c7d0cfef0/gewojuvoxubeke.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/11240954895.pdfIn PDF document text
    • 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_off0000c929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC929 19276 bytes
SHA-256: 31847abf869b201a8a85bfe2e3fa9fe0b1666567ba7899482617358e05b1524d
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11350 10624 bytes
SHA-256: bf36f107dfeea515ad3c8ff7c3d3fd7eaf7da1875e98feeba976130ef46943af

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