Malicious PDF — malware analysis report

Static analysis result for SHA-256 2856f2c4c2d4579c…

MALICIOUS

PDF

70.9 KB Created: 2021-05-26 10:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b7e0cfe638dd807cd899e4dcc59d1273 SHA-1: e4f9a4e9f4f0dfea73897c18b4e14621b86165bd SHA-256: 2856f2c4c2d4579c0d4fa7165dafa4a3d7d6815399096f8c509412c0356aeddd
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm hosted on compromised WordPress sites, likely intended to redirect users to download a malicious application. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7805

Heuristics 5

  • 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
  • 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.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec56c9df01---95452855496.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/td2fpmvaifft5t6gsa1is0523a/47350160283.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f121845ff---59116757104.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/p9quq6hspikermtof48sbt9ccs/30594374247.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4c9d9f1801f610ac3cb5e06b2a5d4b06/tinomob.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4abaf21d2e9e0d7e4ffbb75d117e2576/gusopo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64c0d23cf---jerijaxilisikarug.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/p55qgqh4qlvau0f6q1verecm22/78751985830.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/dizeparozala.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cec154f68---92173683209.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zimagukadesawubat.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/lozivofajoli.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/b0sc7jp8rbsdol10qtfsmh7il4/mevuvad.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979a57c3e9d---52704808076.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160863afbd11cf---62374525247.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=random+stranger+chat+app+apkPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 5528 bytes
SHA-256: 80e51f561486085152f1996bd086f96a7246cffa17241ead51be916d26dbebb8
font_01_sfnt_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 10608 bytes
SHA-256: 260349d34d4b6637a4007853202b5dd5c77107fcf224e67e0ddbce751d8dd2bb

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