Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac104facbd57c68…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 21:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2fe88d6abce36e2ec70cccf484b4572b SHA-1: 422b353ecf991129a44b25deeaf032830494e8c6 SHA-256: cac104facbd57c68db643c68844f62d2fd5b70859b9b2c1f32c01467e2bbf693
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://innovad-ltd.com/userfiles/file/83461410584.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/fh0btolujcth1a7ud82ul973a1/tubotirozonomaji.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/16152137772.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/96310037869.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/941c6fce576e75b54c9a0a138d2e7fa9/78887257444.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/050929168123.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/88674311098.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/sobav.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/4127442431.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/texizenuk.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/jifirimarikixikunegiz.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/modorepuw.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/liririsezoza.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6a54cacf---27428534982.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/maluxujuvikaresogizetavaf.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/12909415471.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/60165290153.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kevotojakunogegusel.pdfIn PDF document text
    • https://stvorki.ru/files/file/lifajuvegikikebo.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/43914739988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=final+fantasy+tactics+hardPDF 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_off0000d4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CF 10412 bytes
SHA-256: a8fc5925a66b74371485d80c997f45317f08f06dc2c3b5181183c6d53620e1b5
font_01_sfnt_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 16800 bytes
SHA-256: aae3b1002c58680465af1662c85e36add4f94cff742e8fc83204478832d74ad1
font_02_sfnt_off000117de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1