Malicious PDF — malware analysis report

Static analysis result for SHA-256 831c4324954e505a…

MALICIOUS

PDF

81.8 KB Created: 2021-06-30 21:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d2e5dd52871920f619aa3b7cd847924 SHA-1: c0ca02d402bda5362c087d31d948c7797e4bac06 SHA-256: 831c4324954e505a16c493624860c766fc49f502608a93edc60284f33f87598c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are likely used to host phishing pages or distribute further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/82103390ed554c2d74fe8dd5b55d34d6/futijuwivulodutiwa.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/4ernimr0tda5u6aj81m7heh7qp/36969483944.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7ffcbe56---gipujadokulil.pdf
    • http://amphorabeautyclub.com/campannas/file/90267630424.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/a1481b94c47a7fced77046088d92b18b/2854250478.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f11445708---38580229481.pdf
    • https://akproauto.net/nbloom/fckuploads/file/faguvudanadibisok.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2c7113c0---sawowega.pdf
    • http://zhengfutz.com/v15/Upload/file/2021630148485642.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/2889p3s5h4m61d038g9q1koe87/zevuxudinago.pdf
    • http://macautemple.com/userfiles/file/71803321137.pdf
    • http://guides2alpes.fr/uploads/file/65116545267.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ee26c29b---87545446334.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f122fb7193---73582289917.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a231cb14d27---wutenagawatu.pdf
    • http://palami.by/images/file/baferuzijusezeji.pdf
    • http://cpgny.com/userfiles/files/wepakodisixadabet.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf465c4d15---83200927941.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094278e1de02---95306004859.pdf
    • http://j1medical.com/uploaded/file/48316531693.pdf
    • http://cathugo.de/res/wysiwyg/file/81007519999.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d3b3ad0af7d9a53709220ea82fd9d30f/59490368661.pdf
    • https://arendic.cl/files/raxidimekipubebumokugisik.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+town+box+office
    • 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_off0000de08.bin
6d336e1c09f666ee02d74a0d1704b0687d0f33291ba1076de79adebb6d88cf5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 10248 bytes
font_01_sfnt_off0000f514.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 16792 bytes
font_02_sfnt_off00010d26.bin
1a9185150b1d42e3157c221b8decea01cc7fdf9485ca7909f5465e587d910cc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 17240 bytes