Malicious PDF — malware analysis report

Static analysis result for SHA-256 c549751c15f60e03…

MALICIOUS

PDF

90.0 KB Created: 2021-07-30 06:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa86aa4757f420a5dae4a7572d2445d3 SHA-1: ec3e455b291fb841d0bf3323a53d69aaceb2dc9f SHA-256: c549751c15f60e03ea19efab043c47168f278d0a2d1f62f9aecac4a45a65765c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ketchas.ru/uplcv?utm_term=descargar+pasion+de+gavilanes+completa+mega PDF link annotation
    • https://mingyi-lock.com/data/file/userfiles/files/nuzevarunozegapebifejedi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4937690cfd---75930209984.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3999cd64a---givisuxujilakogovixafi.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/bbfbfb0aac5402a9e98971044be75e1a/83601543077.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae266bc36aa---kolan.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db1a06c8a7---24551793720.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/tanawozovozimunizopegu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb90178cb7---xonevidenaxemizu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a42ccf8f91b208d1584f37379f5603df/gowakan.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb10af0d09---67746473512.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ed4099045---30610031402.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083673363707---kibejan.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/pozolaxaxuxikonamuwus.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/zewobilipu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4a28a7cf1b97545429c96849ca1cde17/20160296423.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608091e51cf54---fuvemedanenul.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/45297129631.pdfIn PDF document text
    • http://kfbi.ru/content/file/babazewilejifukaz.pdfIn PDF document text
    • https://chp-travel.ir/data/file/kalap.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7f3b19c6---xutenanapamupizetujoledik.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3813e349c21895b1d44c03460e59d860/gimegububuk.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/litetuzoparujabebusaji.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/sozuwajapogug.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094db58c14e5---48867851274.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b325bf2b2b2---5359302679.pdfIn PDF document text
    • 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_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 18056 bytes
SHA-256: a1e1331ee775b91449603dcfddbf456ca699ea4c4fe3e372d4ecf2676089cfe1
font_01_sfnt_off00012749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12749 10924 bytes
SHA-256: 4dc4dea5abd813eae520ed663652141d5a4915775099d9afa2cc2a38f028de84
font_02_sfnt_off0001406d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1