Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf0e4a29ed20616…

MALICIOUS

PDF

71.1 KB Created: 2021-09-08 11:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62fe58069864f0de385a96015ff7730f SHA-1: 266023f5117a41cd99fe6dad6a1de0a4b7c2f825 SHA-256: 0bf0e4a29ed206162d58fb02b1f7ab21775eab1df9bb4c2598f9140bff3a1276
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://local-atlas.ru/userfiles/files/14225723763.pdf In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/beba584dbb38d81d6ac9637784022ce3/lakarobupasutekomakaw.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/97764768206.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6541dd578---52347930929.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/81218268086.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/161079443f1786---pizenubuzuganalar.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/39dad1d928b3f6d062a7706756b9678d/wuveselamukowusisonakom.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/fewevunivofedibajogow.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8298c7270---dawavebuladib.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/141000404305.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/69790769426.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d278f1fea---dovekunoxup.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///fefabodufuxojusenimevibip.pdfIn PDF document text
    • http://mousike.it/img_ins/files/21475746717.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3700009aa7---wuzaj.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/6g7vao7res5kl2lrh2luduodcn/74240208424.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ofdelp1qcvntk0lgrl21rfvn5k/50841284401.pdfIn PDF document text
    • http://compsult.net/userfiles/file/99952603670.pdfIn PDF document text
    • http://lawngo.net/fckfiles/vuniresikagukidoko.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b57dac538d---dumetiw.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210717232017_o7xloa.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/3548497778.pdfIn PDF document text
    • http://allycatering.com/userfiles/98303336163.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/taregubabebobofaropikuzi.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/71dd82cdb929e05d21865cfb994fed48/27187832323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=paragraph+writing+topic+sentence+worksheetPDF 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_off0000b769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 15020 bytes
SHA-256: fb4f48b223ae5c9db070fbeb6e45fa6fa7b2d3b03c2d7e30ba78f84ab6b4a8f3
font_02_sfnt_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 10784 bytes
SHA-256: bb33b6f0d73b6c9e16259f67c77d3d621509fb6f81e26a33ee9cd99fb2c90fcd