Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d7aede3550ae80…

MALICIOUS

PDF

70.9 KB Created: 2021-08-29 14:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 9ccca51863791e87f469ef91e769e662 SHA-1: ea25f59dfdde08f3176e5ee802f6b40a3d0e4625 SHA-256: 52d7aede3550ae8093de1923a505c7793247df80b361f35de6386b59db71e213
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress uploads and disposable hosting domains. These links likely serve as lures to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9bfda28b848ac73790c1ca7188187816/90638101182.pdf In PDF document text
    • https://yaofangpeixun.com/upload/files/87971787265.pdfIn PDF document text
    • https://cape-electronics.com/media/file/37056935786.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/jubapaxenafipufij.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b522f65fd0af0727a51e078cb85a5e58/pululu.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/30f041ea6971a57ff2ec508f665aea61/32466542979.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/feganuku.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/39299031357.pdfIn PDF document text
    • https://efnnma.org/files/file/kegagusefuvamoketola.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/juxiza.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/o6rsi2cjl6fbo6j2i192cka4k0/45888018771.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/uhdcu6336d87609v8m0uksldh4/vesamiwubel.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210603_1CDBF62F856BC1A6.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/mutivuxuketo.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160846129f2308---kijoguwakesagume.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/92648299894.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/82gl1l9vebkpovl39bnn7c4k3f/58217635913.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/wofakakuwaxepobefoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=motivational+thought+for+kidsPDF 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_off0000b659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB659 10752 bytes
SHA-256: 4a39c707097dbcd251802d92ae13b001571c60254cfbf0e5f0fcb51f5e61207b
font_01_sfnt_off0000ced9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 15300 bytes
SHA-256: 6f32de10d6fec5529d3e0f3ad6c65cf6bd328fba09778939f8e8a66a6d6911d8