Malicious PDF — malware analysis report

Static analysis result for SHA-256 062a9f02a06b39db…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 23:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b190a53f95661e9d2a73546839f05e1 SHA-1: 361da289cbf783805287b82f9c28b78920cc079b SHA-256: 062a9f02a06b39db6effe100ccde2939104af4d9e307f99b82146778e6527cf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The primary purpose appears to be to lure users to malicious or compromised websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/42563204048.pdf In PDF document text
    • http://bkdesign.ee/userfiles/file/dojunewewokevagomopewon.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/8476913893.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/momalaloguvemuvilokalur.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/52566751211.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874dce9d57a---geruwozivuzulokalawuxuwu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8qdirvevl27lqvgvjtrg3tbuv0/zarezibid.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/f9btgc553jv62vpbdnr7aqdlft/vomokulaza.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/98221633619.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b30e067bc1f6b92e08455d886966b408/1703182881.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0de39e7d0---xikilefiganumikezikef.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160794c178bd6d---16710653051.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b33ee87ad63114b838a133f6f2dd1b28/58115224873.pdfIn PDF document text
    • https://devismesport.fr/userfiles/file/keredesokog.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/4821559246.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d95698d54598e803698f48be40cb80db/sugobowalera.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16110bb8d4e867---dojubataralatip.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/67166070339.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c506555c705---nefuruduwobusa.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/7277317638.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/234ppb4p2lkam8duqb5d6s2rq4/jigelurepajitozadi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73d05705df359ee3311d3cbfdee98e86/jujaxuvixugenukodewata.pdfIn PDF document text
    • https://armenia4d.com/contents/files/lisabobabitasufasukexer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=southern+railway+route+map+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_off0000b933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB933 10968 bytes
SHA-256: f9d87f569b3905d61b6990c42c1b05272b6b9ce2b11904a9ca67cf6283e2e25f
font_01_sfnt_off0000d292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 16132 bytes
SHA-256: 9e6e59dd9673d2e10f9518f72cf414a8b88af506a1744c47cea7c643d48a67d2

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