Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8566fc45669ef6b…

MALICIOUS

PDF

135.0 KB Created: 2021-06-30 04:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 93129c583fc30e380ef833b8affe3a59 SHA-1: 87c256ba484924c397161e6e11e1ba0b16dfaa76 SHA-256: d8566fc45669ef6b5b01ed2d72bc4dd84bfa5b69593202891c67f457fb02f4f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9380

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 http://sparkpro.lv/content/file/92861296359.pdf In PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f6644583c54d1d331652e903110a46e2/74144566949.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d352ee9b1---lorig.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/18148122965.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/38ce74f25dc409659c4c029e6e5527bd/60620598726.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s41lf6nnvootd9l8h40tvopra2/dimuwanumiwokavisejukuk.pdfIn PDF document text
    • http://elitvorota.ru/f/file/gepiripemoxabusoj.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ac96d0c1a75---volurojunutilowoku.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8202d5faf---35905136249.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf799e66cf---semuvadazifem.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/1813787675.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a899290fc0---xejejowezo.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/68429435201.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6a12740d---39713020318.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9c17298cb6a4fc0388fcc7cf541272d6/faburikidanazo.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/68629156356.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/sebuperoloz.pdfIn PDF document text
    • https://dm288.rs/slicice/file/vamutuzikemu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/iji6c7r4l8efkpicjeo69oopk1/sorevedodeto.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/zamebikozokum.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/v0atfufa5d2cnjrqr12jc750r7/76596346773.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/68918540716.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf103e445f---muboxumup.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/22500087207.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f450e03a727facc6acf3eabe3311c8e2/sivufudawubowiveza.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/dd7ae84ef5fdcc65401c0c9fae2f0c24/88443699940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+first+astronomerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7B0 10396 bytes
SHA-256: 30bc435d580a6715295f5e4b3c6efc8c0e88e01576bd49b2407d54580c3e4836
font_02_sfnt_off0001cf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF04 1968 bytes
SHA-256: 28b6d339b98ca45f87cb0569e771d42e291f8802d69f7590b27fa511bc4960b7
font_03_sfnt_off0001d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7FD 21288 bytes
SHA-256: e82523dea85bc9b985f4bcb8d45f469ebea203ca4c0a65db45d362200e40b57c