Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf065826c8b922c5…

MALICIOUS

PDF

93.4 KB Created: 2021-06-12 13:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a0a0774f7a3a68dc9dc607642b5c7825 SHA-1: 727e6e42fb7b9110ee54096329c56dc7d86a6d8e SHA-256: cf065826c8b922c5a6a05ec3859403ff842ff5d384f2d094f15e19c1cd5c7ebe
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a TV show, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=season+8+episode+1+chicago+fire PDF link annotation
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082047f3bc4d---86058415019.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/98167369747.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/47601708137.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/hdvv8brcjnb8gv14sl30ieui86/46161838691.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1de311d83ffe61315fea0227dc32de92/refefikiweroxif.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/lovifimerad.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b6bed3fa8---mejumenetuxufanudezewu.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f726d8645b---fipesadigex.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/46662994658.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/121ba45402dc4fdf9736ba3edc5a0112/debutudojetesupudokuvinu.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a8e09c93---xupurowukexire.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/99229898101.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/41029148645.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1df63946---zazewisifekosatefabo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D19 5732 bytes
SHA-256: c7cc8903de669fe35aba802c047c75137b9d36a39765ea1ee66a5dbf2c0be308
font_01_sfnt_off000140a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A1 12540 bytes
SHA-256: b02a2a208eae2cfee396ee2fd248d17c477325d123c81dc86580ebe3fcabdbdf

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