Malicious PDF — malware analysis report

Static analysis result for SHA-256 7759e9bce4c8c634…

MALICIOUS

PDF

96.8 KB Created: 2021-06-27 12:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 51846aef185011c84dec9df423c96afb SHA-1: 9f505eb75c9a66c4f6840aa6eb4c37e47eb98791 SHA-256: 7759e9bce4c8c6347e3112662f1e97f0c580f2838ae7b2249b0103d636a6c640
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised WordPress sites. The primary purpose appears to be SEO poisoning or directing users to malicious content through a chain of compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/omvvonngn09vaak75j8vrg60a5/70902516459.pdf In PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e93565dc48c4041566fd47db8656f7cd/84031641370.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/u16pqt09pbg6b3aahbhgmj0c33/28454644711.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/jesotudefavov.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160763d4f19338---13405567747.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/46940372697.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210626040305.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1620957912216.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/76336829943.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/37kpb4hm78f0cq88rhs9g2cmp0/28636407938.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/nopiribolon.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d845ec3c0---toredopusiw.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/89150785115.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160726c956d027---1808255259.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/83547080325.pdfIn PDF document text
    • https://aashianarealty.com/file/buvujevegedikem.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d790f21c9ba4e03a956ce048e44cd27b/vuzirelibotelideduj.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63322e7cb1dfb039ab4280ae7dd2e5f2/63312266334.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607716b18bb51---85792821292.pdfIn PDF document text
    • https://securitydm.com/slicice/file/3965113784.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768a7ce9aad---feriwixa.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/pisutusewejekefib.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/71527386830.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/63409827232.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1k4m65fqooefbhl7i6pheuie00/22791744770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=capitalist+mode+of+productionPDF 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_off0001160a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 17276 bytes
SHA-256: faa42a1f310e6ea1911aca2d18d0a4ab62973aea7f13c7e6d57c751a33cd1e50
font_01_sfnt_off000142ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B06 10912 bytes
SHA-256: 5ad092c134233e4036323df35624047bc2574e6ff8b5e0c6163ff72775d8a63f