Malicious PDF — malware analysis report

Static analysis result for SHA-256 9305dda5d2eed00b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 00:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0c1a3e786bb8e4877ad47498b3c5399d SHA-1: e8d2abfed131ee1da6b1deebb4cff1b9b41222c3 SHA-256: 9305dda5d2eed00be34f6bdc48424218d6b03e4603e690c31ddafa3f0be7acd6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites or hosting malicious content. The presence of multiple PDF link farm heuristics and embedded URLs suggests an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://trunghungplastic.com/luutru/files/linifipokuku.pdf In PDF document text
    • http://vickerycarpet.com/uploads/images//files/vewivurijujisewixutof.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/hmeos18d870kaev4i6li37dc5o/vusizaw.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7339434882.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/71196071800.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/fivowodemawul.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/30219778501.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092123885bdf---53032645518.pdfIn PDF document text
    • https://sanagustin.cl/files/fisusinuniradale.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ecubhd7iq1c7ebacgt00j2vmu7/vuwuzadiligolowepitat.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/18h5aioo2dtbbrr9hcgifdahpl/tavitamokewirugakupalani.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/053861384566f9066dd640d08f4a19bf/buxedaw.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/tuzalajumewaradugime.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/185392eb77d0a7b805b1439a5fb1e603/63593706239.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6978d049d---nopakenuwagonitomobo.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/65863473904.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126d968d5430---39407135985.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff12906a63---lajujosufewalenuzasonig.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9810806ebc---68500503547.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/lefedu.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/91938929501.pdfIn PDF document text
    • http://halmar.info/userfiles/file/33042729534.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/11160620871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=world+time+zones+maths+worksheetsPDF 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_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 10744 bytes
SHA-256: 1546bdf15fbd0b0035240eed4ad022fdd29bc531f61e13d0cd5ddd43cb8b23a3
font_01_sfnt_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 18204 bytes
SHA-256: 5dbf1f4d98e3f7200b04a1911af010ca2aa99ba634b0fcaa49e2cbd08dd4eb49
font_02_sfnt_off00011fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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