Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbd5d90bd8de842…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 10:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aefa0bb2fdbb4fe8ecaa42707e97d157 SHA-1: 3750cfcbf69c35475b4187d0990f15e6c4dfd220 SHA-256: 4bbd5d90bd8de842604873eb9a5650a4e2781864bbb1efcde984bf16dc5dd65f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alcantara.cz/data/file/20599201050.pdf In PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/73590894127.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3ae0e5f629aaf393f9f38810df921bcd/67392453277.pdfIn PDF document text
    • http://shahgrp.com/uploads/naxepeliwotoradurusorubel.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614014023c010---88533109152.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/230b20947086c415f7afe7eda086a4d0/53365456100.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3f833aa67---59010847234.pdfIn PDF document text
    • http://abwessex.com/uploads/files/tamomemomajaseleforizuki.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/bixunumujitived.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/julofigofam.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/41776442544.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/titalajaziwotef.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/piwipe.pdfIn PDF document text
    • http://htygroup.com/upload/files/62439575378.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/fuwobokawisunadumuwaz.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/98642317181.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/gufisadutabulapoziso.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/64500253539.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f34a78ab---79819183934.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/49514443043.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161381d4e79ec5---99044606709.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78029079111.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/jukalulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=feel+off+balancePDF 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_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 9988 bytes
SHA-256: f92b340c37de9a7dd9d987ef4c6d5f03f181b4cddfa40920c08ef320f299211f
font_01_sfnt_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 18172 bytes
SHA-256: ad555ac329b4e9af74ed7ed961d207fd2b2629b65843fb509979ed158df6b90a

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