Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cac626efa75b9cc…

MALICIOUS

PDF

71.9 KB Created: 2021-09-08 14:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 041c06ab819674d0099a7cd89b0b384c SHA-1: 1487a3a48a6f11771b347a94416b1c8f90bced57 SHA-256: 1cac626efa75b9cc006cb85bf971c3c54e130d7e8c7baa77f72a998fe08fad68
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs hosted on disposable or compromised domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/25640231009.pdf In PDF document text
    • http://jhdjt.com/images/upload/File/76756677392.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/zuvezuxune.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/2936251365.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/66008620311.pdfIn PDF document text
    • http://amandamaitland.com/images/file/17240425633.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/eletrarbp3tuhbkurledmltpqr/dokonapivarawisitaxupevu.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210905095836288.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210907172336.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/zameda.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/66161340517.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/58953829810.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/39340445416.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/51233667707.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/2622364363.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/81492216666.pdfIn PDF document text
    • http://texmet.pl/userimages/file/rewedefo.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613188175526b---71546650607.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/66817951295.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613013dda7f8f---48255596580.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/ketawofizo.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/93300287156.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/67189617232.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/292338895.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/gujunadowozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=weight+loss+foods+in+tamil+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_off0000b8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C7 15816 bytes
SHA-256: 512c4518c012729dd275d73b0463ca9efdc41500e7423fb0bd181295b41ffaf5
font_01_sfnt_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 10836 bytes
SHA-256: aa6ddfbe2c180a6545b9ab8b1c7202ac7e9c6ff576c7e54b3dd30c044401621c
font_02_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1