Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb0133d6d2c1995…

MALICIOUS

PDF

80.4 KB Created: 2021-10-08 04:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9e81c215605c2282d7861829d9f361e5 SHA-1: afd1ff2417eb63ac31b2d1627587b17488de282a SHA-256: 6cb0133d6d2c19956058d154124f45a43cb3f73b833c4977f0adb4d10a6bcd7d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a collection of links, potentially to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=cit+in+the+community+answers PDF link annotation
    • http://kbidc.kr/upload/editor/file/1632552172.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/nuxefoxepaxoroxib.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16149087023afe---87063636867.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/46384096184.pdfIn PDF document text
    • http://kachelofen-prommegger.at/46679194529.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/liwogame.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/75252858854.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/79803048626.pdfIn PDF document text
    • http://szm.hu/userfiles/file/vidiwamefejalexun.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1047fdaa3e02511c3bbecb5cd7be377c/60973873903.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/6003678273.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/11047199026.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/22388447451.pdfIn PDF document text
    • http://artospace.com/pics/file/nupakimavasemanovalo.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/63589199899.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/13854060027.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/pavugobamedejitilukuzapem.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615857292480f---73985241753.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/xafobizilifojudojiredopak.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/sixipamarupo.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/13206636294.pdfIn PDF document text
    • https://hinaweb.com/upload/file/xuxofovujeb.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1615f6441d2df7---saforini.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/91231735834.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_off0000cf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4F 19620 bytes
SHA-256: 29aa7891399387ea6d89ace192acf38568003d55075544bd57401044142026e9
font_01_sfnt_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 10780 bytes
SHA-256: 0a19f42d31eb574f86ac472399691c604075778cb7ab7131d24e416dc565632d
font_02_sfnt_off00011af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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