Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e8f6f9f7a8b803…

MALICIOUS

PDF

100.9 KB Created: 2021-07-09 02:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 41965ccdeac97bc14dd96819e4b6b921 SHA-1: 3f4017098e4a4307e135aeb87ef2afcdd9a8414c SHA-256: 03e8f6f9f7a8b8038c41913f3b385224f9b08ea6efbf90f44af7add43fd5087a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure itself is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://t2sc.me/userfiles/97267531914.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/er9b42sb083n3c17vuqmfmgdk6/11340542887.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1c16bce1e58806e5cccbccda8b72435b/18615754256.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/6d9cb487abad5deded4a6a449e7d2d19/gakedodejidakiro.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/bb5b11e0d4d3a0da3a42d7724984eae3/rawirebadomozipub.pdfIn PDF document text
    • http://voijin.com/userfiles/files/42963798400.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f090a1908b441cc3db8821baa0be924d/wopunopixewuwonozipetozaw.pdfIn PDF document text
    • http://adveotec.com/img/file/nawabibalajifamupat.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160935b7c86cf7---silubopor.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/97d5ada5db1b15a08e6337a885859c21/69692646398.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608efaa676666---pokuti.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9198d8a50---xolevabogid.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/bnsu0jiuvjm879u0ccl0dfi12m/xomezerorapurumasateniwi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/63hbdpc61bg051dvo8bcbvd4j6/selabomalazadebetovo.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/25398347389.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/tifikox.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/xowebevojuxiwebafuj.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4bf089b27cdb28e5ddb400f706bf0ca6/74487092605.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/75036492522.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/dipojeme.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/nipapufosumamizozopiri.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/nozegonotes.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8cea94f50a5ff2abc5f0a0bc4a3f4b5e/feduzedawipugubeguradid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=list+of+producers+consumers+and+decomposersPDF 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_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001411d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411D 16964 bytes
SHA-256: 66fc4456a7132879bf509635e1491033da6c5809b3d09a81b313389c772adf40
font_02_sfnt_off00016d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D55 10792 bytes
SHA-256: a7f1747cebe56b76b4ed992eb8f47efa5aa06088ceb2412e68b364a7d234e0de

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