Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6e75757f313403…

MALICIOUS

PDF

78.7 KB Created: 2021-09-22 15:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 325e0ba4ed363792269e2d1a36103442 SHA-1: 38ef853c1ac9c8fc8dc4d1c1711b60ec8f4ae1af SHA-256: 9d6e75757f313403d8aab32c531105db4e43294d842e231b96c1e862c128fa94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple domains, several of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://attack.lt/images/files/30765822730.pdf In PDF document text
    • http://saktigroup.in/uploads/paleratipivinazojagavuda.pdfIn PDF document text
    • http://mcutech.net/files/30330705749.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/21086899091.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/kegobejan.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a330c1e024---robemuwe.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/59480891079.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///dinap.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/84865105957.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/18784448946.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/98996557667.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/sojizox.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b8023b41---71293725314.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132283fe7f8a---reravuzunipexura.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/tofevugizajosufekiven.pdfIn PDF document text
    • https://gulamanis.com/contents/files/bamuxawuwalef.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/92909125586.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/65917470277.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/98762394498.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/61098765867.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/44749289542.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8ac654dd---tisigezokakexusomitoxaner.pdfIn PDF document text
    • http://nfc.soo.jp/file/44014320961.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/doxugadasomilutijora.pdfIn PDF document text
    • http://effektfilm.de/files/file/majivoxozegat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=idle+ants+gamePDF 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_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 16016 bytes
SHA-256: 633764e43f11dfe75dc079ff84475118be2395b8f03c3c2eaa4427d67223a1b2
font_01_sfnt_off0000feb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 10232 bytes
SHA-256: fada42511429ac4b3a720fa9ae686373cc6988355d8d5690719b8d60f5ce7428
font_02_sfnt_off00011572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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