Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fac18412f687f5f…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 22:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e70cfd9dbefcd3a316a46e70598304d0 SHA-1: deaf27e87e620df60eda6261cf2c0067a4744e9f SHA-256: 7fac18412f687f5ff8f44440e86419fb1c13ccd9df3987cedbc370a519dd439a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this document is designed to host and distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://letajicikoberce.cz/userfiles/file/39929381104.pdf In PDF document text
    • http://jn-zhsc.com/upload/74409136071.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/24411570761.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/romotukutawususizid.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfad3645da---bodogug.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/24382837352.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/o6p402gter2gmsetvk2eludd4p/zixopojazomepuvazabifo.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/kineborofetewezoxomaru.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/patekupise.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/fonajarizef.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a470702661---jawumavadex.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/42547977742.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/17173938239.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/32747270582.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/23439997635.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142096c369c3---18669022236.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/29200749515.pdfIn PDF document text
    • http://superazs.ru/images/news/file/sisuxilavikogepewulo.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/73529823912.pdfIn PDF document text
    • http://feg.vn/uploads/files/xitulox.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/keguzukimerakopikiko.pdfIn PDF document text
    • http://elsped.hu/files/file/61108284153.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/30418226664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=review+and+download+android+gamePDF 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_off0000aed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED6 10520 bytes
SHA-256: 82648829aa1fc1f3b9df75a67cb004549010c65f2f6dbf12fbe5aa3c640e5a97
font_01_sfnt_off0000c687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 16472 bytes
SHA-256: 1c7c9255f18f5d816620d79f74dda29c4c4daff0544ae207c310fee92f3efad1
font_02_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1