Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf878c1634934daf…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 21:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 450d5cfc7ae8129f7405c2bca21795c2 SHA-1: 431285808ad261d0c3c9799742ab8f51b5dbe8fb SHA-256: bf878c1634934dafaee9c5f1df2a41f96d95db8937f66b2cffd02f0088b6b5f2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URI links and the overall structure suggest an attempt to redirect users to malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/163202275.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3gqf5etn2gsp081r4gemfq08c1/29686131909.pdfIn PDF document text
    • http://rs-entp.com/upload/file/84688823731.pdfIn PDF document text
    • http://jucal.es/images/file/73734458463.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160942b2909724---47593443053.pdfIn PDF document text
    • http://kunbot.com/upload/files/79116114000.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/56278578242.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/8767924638.pdfIn PDF document text
    • http://riversedgefm.com/files/file/roputaz.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/54473529544.pdfIn PDF document text
    • http://rayanchem.com/d/files/kerone.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9d216eba84ec368ffccb4d531cefcaeb/jarulexewiwafalokokawu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43637a01cb---21671085731.pdfIn PDF document text
    • http://devison-matras.com/upload/file/dapadi.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e7a0d12d75c69462709133af1753c773/kisuxelomawadalono.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/99810994224.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610faa9546f71---vuzebaruxiwitopototanil.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c2ceeed6---japireli.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/99577613678.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/67310188248.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/sumanolujujawugazip.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/21aae256ec0547858a036cfb1d775e06/12296271772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=insert+pdf+download+link+in+htmlPDF 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_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 10892 bytes
SHA-256: 658fcec1d4cd219b08dcfa27454765ccfed277b8c85be7c194e5075c8d4c0dcc
font_01_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 16628 bytes
SHA-256: 949d7980fb014e969971a91925b4cbd16177fa31ad4b34421979d69e709ce8a3

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