Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96bc8f29b6775bf…

MALICIOUS

PDF

98.9 KB Created: 2021-07-24 13:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9416f2b3e472ded2fd551bb6618334f SHA-1: d1a8f0c84f9cc8ae4130f5c5697fadc82f4bcb3d SHA-256: d96bc8f29b6775bfe4205970c8ba14978641c1566ebc090ca16f545cf1b3adcd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The authoring application 'wkhtmltopdf' is unusual for a malicious document, but the overall structure and URL distribution strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5c171b50---xolijogadipotero.pdf In PDF document text
    • http://acm-medicali.it/userfiles/files/gopiwumopow.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/91988651793.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/wesokenikonasuzopanixeruf.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/85738987098.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c60d732b---tasasumisuvo.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0ef58c447---muwilireterog.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c644f605641---pafiputagivoroxo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160871e84a1769---79412289095.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6c7422274---83301207832.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/0c9a67e42ebe530ce295439dcda359f2/jeruxa.pdfIn PDF document text
    • https://cargotavio.ru/files/file/tasedife.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097eb328f9e4---79124641171.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/xedusimajifujesejimaz.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3df5eeecc2446239b24aa62a25fbdacc/kukibusawufabofagufogibo.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/42b685822638248f7df17b99e67db04a/72659950389.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609871aba40f2---89734620016.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/fogim.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/30ff1920a74717f0c4e6a27d82b1ff4f/nafubanapiwa.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/27115581147.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744ae47c0cd---lorugonumujagez.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/74893b1770ad215472e67e7462d2cd30/45182695756.pdfIn PDF document text
    • https://egf.tw/test2/images/file/16568482630.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/tonofubewo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/99ddbc7efa136a17ba7b3ad292fd85ea/nupigibeguzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=virtual+lab+punnett+squares+table+answersPDF 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_off00011e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001367a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367A 10568 bytes
SHA-256: 098ae128efb8adf5fcea77b2ac6b1dfa7daf7db5acc78375d30d5422af9e1bb8
font_02_sfnt_off00014e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E89 17932 bytes
SHA-256: ec13dc0de2857b9b363a691c65c3b20e2341dd4a908c0d4fedf8f0b8e485b466

Open this report in the interactive analyzer, or submit your own file for analysis.