Malicious PDF — malware analysis report

Static analysis result for SHA-256 0829a652c5918d98…

MALICIOUS

PDF

87.5 KB Created: 2021-06-12 02:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e47ce66e2ba5398796804d554187df19 SHA-1: 548c6b820c0c06080f5d2156536adba23e7257de SHA-256: 0829a652c5918d98b61b35ff440a360bebdbeccf6f8d7b0f02456ff43bc1203e
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laborke.ru/uplcv?utm_term=crash+sites+csgo PDF link annotation
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/ccc8c425a6edf116f869819a1bbf44bb/11597650787.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099d78f74686---negezupuzudidageteb.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2e8tt985ucuo51pihp4cpfhk4v/faniruxifabasudezatorol.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6/%5C/202161263307995.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54f429fdd---xexejofanutiwad.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae3155e37---83795492536.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/61893961218.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c4e3562d1---sajavak.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/2323cc8b64b8ced62bad640024ce04b9/52894196844.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983423ec78a---xalasezok.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/55497974331.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097b55b0d7e8---fofavufigisidanu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f697835390---84950917491.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7b58d3bc---sopoxijin.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/9dd2e633ee14bff74317edb9624f985a/11270545235.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn 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_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 4732 bytes
SHA-256: c7a0943633b0be70e741cb71120a798fe5b18a3fcc5af3c3b5013cb7f6924fb2
font_01_sfnt_off00010419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 11280 bytes
SHA-256: 1b1c2972db3195c263036d83f2ee1f33f4c4e037affad7f4e743e9f19e0b4574
font_02_sfnt_off00012a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A56 17152 bytes
SHA-256: a0c6981fcd80f1585e35eafa781d0ba7c040bf6c5673dc251f8a294fe011fc38
font_03_sfnt_off000142fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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