Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc8ed6c9f202cf8…

MALICIOUS

PDF

72.8 KB Created: 2021-09-07 14:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 852839dbca8fbb6fbdf05807f3ea69fe SHA-1: e86a957d493332da7b78918d45c190f28e785e0f SHA-256: ffc8ed6c9f202cf8a8ba7df52ddcd45231f5db52c87074b9b4620858cef35a89
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. Heuristics indicate this is a link farm on disposable hosting, designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55c906594---24312003835.pdf In PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5f26dddf6267dbbb5962d88da81c5577/6234529207.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/wepibasofirexovijuwala.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f9c6e3abc5027b0648ec8238681c62b4/famavenopa.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7e7d1c36ad737265f2a2be1f954df039/tutajatip.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c92932ef4f1d32686ca224fc8165e225/vuvagenamimuvetu.pdfIn PDF document text
    • https://photofetimages.com/xaxejoxupaxapi.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/26811647095.pdfIn PDF document text
    • http://fabienneblavier.be/upload/files/towit.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/34608684930.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/4109895998.pdfIn PDF document text
    • http://lottfamilyreunion.com/clients/878857/File/71694337797.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cf80212add563c5c71184647941b8a7e/24773890227.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/21263394562.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9303712b9---zegudotufijadoru.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/butosigaxixazar.pdfIn PDF document text
    • https://plasy.com/uploads/file/56764951870.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/79869779835.pdfIn PDF document text
    • http://chikatere.com/Upload/files/bogixogolif.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/4be953cb38c53f8e8ce2d8e3d6b68b0b/20619308521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=baguio+map+pdfPDF 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_off0000bcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB0 16436 bytes
SHA-256: e8b67171a114fd4976fc19adfd36069db1d8e90fad1f11f250c1929c9f7ab5b4
font_01_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 10348 bytes
SHA-256: b62688a937966f6ae2227152cc62e3b253b2dec0b601581babd0a717245dc48b