Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ab88a1a3484388…

MALICIOUS

PDF

72.9 KB Created: 2021-08-02 22:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5dbaede6d144ab1363f05286d317ef43 SHA-1: 59f4e1bb3bba3a7b46965f95ee1e25354ace6914 SHA-256: 61ab88a1a348438823932dd81151650ec50c16a9ca6524e5812b5132af25ae97
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on compromised websites or disposable domains, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://goldway.jp/upload/board/file/xogodap.pdf In PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2bf0bd441ae667227e01995fc5e658a7/76081882116.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/3d7cccc8799a93cc85c9c42dc0a51f52/62652640826.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/791353fbbc5553a0af4e336ba1ea72a2/89354492291.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/56068381181.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/62721127601.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/v0p3av2k0rkj3qd5jmu77a2m33/48904779275.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ee503a0a82b---zabujusuna.pdfIn PDF document text
    • http://partnercable.hu/files/zasijotu.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/xifefuvifulepur.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/setabovekax.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/48799234963.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fda4e7c59c---potiwitoxisasumexivukaz.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/suposizew.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e968828998---zoletowugosodefen.pdfIn PDF document text
    • http://thaide.org/userfiles/file/91183523622.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210726_144933.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/24276399121.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/27872321345.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/benonesejesexinenu.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609407ab76b94---80938492846.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0db4e30b---sapokizuxojojepituxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pattern+programs+in+c+pdf+downloadPDF 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_off0000ba7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7C 11048 bytes
SHA-256: cc9a41ada6da47d3537243f922cf06e45d041bfe6095d4bc15dd6c22b0e3a973
font_01_sfnt_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 15800 bytes
SHA-256: 265ff0a17745ee692169b37c86d0bb020d51db42c4bdc1c7d0acc3607570e629
font_02_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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