Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02b905cb4d4975a…

MALICIOUS

PDF

88.3 KB Created: 2021-07-03 00:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb45c24b3fb9a6af6f683538254ae438 SHA-1: 19c133311d1404a7bc3fa928d35f9a4291e6637f SHA-256: b02b905cb4d4975afef9f77541fc51e665d9caea1964a10a186bda1f7c4b8673
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such documents for SEO manipulation or to host malicious links. The presence of numerous unknown URLs suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/9f61bb735e067b511f4e99b2120d4f99/15994070926.pdf
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/51537674768.pdf
    • https://annjulieskarpmo.com/userfiles/file/fofovovifumasenav.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1aeff60abf2ce0d3dc34d6ce6a5f269f/38323406778.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a36602e4420---zuzakikufilorepik.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4ebdqsgvnd44p6tt56nchs287m/43726945730.pdf
    • http://manixcnc.com/ckupload/files/vujixidov.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841c35385a3---45888684868.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5de8195260---fikolawixigedefiri.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a83a9d4d8---xomifufobi.pdf
    • http://desagresbrts.com/clients/34568/File/45355039041.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726eb1423f5---61049845688.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b821fae2e5c---70520022656.pdf
    • http://sanarina.de/ckfinder/userfiles/files/zodegeponixibu.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b75db274bd5---sufosorovusutezarakesuji.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/15bbd1c93398b643bec82d4ebceb4cb5/87192337288.pdf
    • http://adamlegal.com/userfiles/file/15726647512.pdf
    • http://119hero.kr/userData/board/file/nilubedonepol.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d8a1afffe---mokoxodopazoxinimab.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/48c1a8eef892bb42268aa947a66ebe39/39924633775.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/20332c04e80cc77b01e83f478664a56e/28524290397.pdf
    • http://relatives-united.com/clients/75139/File/40373344389.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a717d9a9d---32598133584.pdf
    • https://cabsfromheathrow.com/userfiles/file/20019524808.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+critique+of+practical+reason+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6de.bin
45ba19afb194f8840c2a43e5b4cf4cbd89cfb282ddc52224abf1a1e12f1e3dd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 16944 bytes
font_01_sfnt_off000122b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122B3 16792 bytes
font_02_sfnt_off00013aca.bin
73f393a0fec8d84d2748f9ada9757b0d728b2255aa4d198e30d3b70e8ab50a52
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACA 10924 bytes