Malicious PDF — malware analysis report

Static analysis result for SHA-256 000b23f5b0fde08a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 04:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 509bff2e682e590c0b5550ffc19420fb SHA-1: bc1e50b9d2be785cdb8ea59178930362bbe7130e SHA-256: 000b23f5b0fde08aa58350d8a88d4d8e21aee34aff88355f5dc6c6576f2477b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_URI' heuristic indicate an attempt to lead users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=entrench+definition+law PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9672b6bd10---95699101728.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0734ab1e1e6b6d54aa528e7ba9cdf8ba/39850800195.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/xebasakovepagif.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/205f3319af6edd008215222c8d168ad9/31632622354.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/27671268244.pdfIn PDF document text
    • http://wwsm-us.com/files/file/xanezaza.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/93105663499.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/vaxab.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/revorozobimafugafero.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c97dfaa9634---vebobuginenopexegix.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/69321129565.pdfIn PDF document text
    • https://digireg.li/upload/kakek.pdfIn PDF document text
    • https://efnnma.org/files/file/21743691273.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/bajimede.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/besuj.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/kodanirokusekarupusabu.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/47497199483.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/25dd1dd16c51b9a16368bbdd332fcd2f/nafapejidipevibi.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/somowovaju.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607102d125511---fanelemazulidisefel.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/24973641792.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/97893025474.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160891a95ebb91---suwiv.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/gapijajomijotosoxisoz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 18172 bytes
SHA-256: c8bbb602520b6a5a39251a388f46a3d41ae4d40a9d3c583fec4a796c32ca9486
font_01_sfnt_off00011446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5D 10476 bytes
SHA-256: dc27f80f8160742c2288a611caee2922fb9f47eb53c8f1504af97976da1d2ef3

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