Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6db098647f0161…

MALICIOUS

PDF

100.9 KB Created: 2021-06-27 01:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2b79b573cc429aa93325dd9709e67201 SHA-1: a4c3737a9b89513fb61503bedc712c18228f0cb3 SHA-256: 0c6db098647f0161b16a294e961f1461e431897adfdea76fa4abc9c14488a23e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external URIs and link farms pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics strongly indicate that the PDF is intended to redirect users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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=the+soul+of+darkness PDF link annotation
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/1taq7sm8koqo8m5dutadni3tht/52332472196.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/56bd9o5knldcu3lfpbmoffbe9m/91100564154.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b46639afdb0---wulirifozo.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/xinelujolisanoreboremimat.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099b2c4f3dc9---tojivofar.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/36628067310.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/7dc86fbce94b362aba57f8a7b8983b85/tovaxugonewivixexo.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/8460ebfebce8674eda4f21fa08695f81/97176504205.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/28b340925b88732a913d55083a0fd6fd/palolaturodefewu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dce1dd965---92724560883.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4541c9104b---nepimapopefidalasupubis.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/wudozaj.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/64398946784.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/42064836078.pdfIn PDF document text
    • https://susta.vn/userfiles/file/fixajupixujezowiz.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/mdc7b8qoutgvkgi9sqq8t0oida/mixulujulabitif.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/bac85554041f7453d4695545227f412d/jurelupenewatevi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b622ea3eb6f---mopenobamameroxevusaz.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b60664278e5---53509811353.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160860008a175f---nodemorejaxixinin.pdfIn PDF document text
    • https://etadelloro.it/images/file/ronukikusexilis.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/j3tlbht70jc1not958gig6jrdh/fomukeponimux.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/laketajesorefuxawapo.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/97388157783.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9d2f6171887878d177efb690321ec7e5/27053852814.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9d97ac6d756bc240d1a208a2db71a486/11973795108.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 17652 bytes
SHA-256: 4ed9f179abb0fb266b2a0a8f647e49c58322d6da5bcd393200cb452b489afa83
font_01_sfnt_off000128ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CA 17616 bytes
SHA-256: 4acd95a59d47ad873c19351b97f4ba49ec8126749f992ec6eb7f011f97f82e37
font_02_sfnt_off0001564f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564F 10416 bytes
SHA-256: 8e54ec7db7bbe55b83aa0d2fdff64c3956ccab9faadca8f0cadca6df485e5649
font_03_sfnt_off00016de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1