Malicious PDF — malware analysis report

Static analysis result for SHA-256 272522a703027559…

MALICIOUS

PDF

109.8 KB Created: 2021-08-12 07:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2e3ff98fbf4c8ea190ffe99bfdfcc536 SHA-1: d1e706801538306e1622ca093d602230856bbc42 SHA-256: 272522a703027559b1b5cc787892d01ceffdc7e59afd34839620f66dabc96d93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=nebulous+hack+apk+2019 PDF link annotation
    • http://rencontres-icare.org/userfiles/file/2977483401.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9242ceeb9---27240442332.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/abv64isa90t0rlsjjtdckt5fpa/desobuzenenabom.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815ce2838dd---99064056323.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/14df9564a24ae565a4610e91f2da6221/vixujavesuzobefe.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/fanolomijenibafexixit.pdfIn PDF document text
    • http://charivne.info/images/file/fomilawovas.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/33161738874.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c5a243092---73856263677.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f019f1a0ef---xewalenamunew.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3a5ejnn4bv3er0i7ipnh5i3s77/35568114564.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c97189a5eff---346433563.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/66172136565.pdfIn PDF document text
    • http://progetec.org/userfiles/files/mopera.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/2pj4sr9teaevv5nm91dno95oil/95093079043.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/kedamofetubusawatikelo.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b920c74ca0---mebegejawizuno.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c956afcd6---19920343850.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/c2o66pil7ccr0e1i3h54j21966/sexibom.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/jisozokemebomug.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f53bd3eb---28988655431.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/33754190119.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607155d5ced29---27569825415.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/834705869.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
stream_004_off00014732.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14732 25816 bytes
SHA-256: 0667a58a6b85e66a0c14b2de1e263f975e19b81a570a05a3ba58592be7ad6b09
font_00_sfnt_off000114e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 19352 bytes
SHA-256: f57327b6e36ed3b2196204136c5257a30e5cb0a0a54280acc42b43fe20e517c9
font_02_sfnt_off00017689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EA0 10848 bytes
SHA-256: 6756ff4a7bf9402cd3eb482ff251c42e3d1d28140014ad4e30860f4aba20b3a7

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