Malicious PDF — malware analysis report

Static analysis result for SHA-256 463ceb8b4095dac2…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 05:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8f6129e6a83b68b5abeaa45f9e457c4 SHA-1: 6de68cb40b82748e0854454de0180037c7160c98 SHA-256: 463ceb8b4095dac2266ee463b7ec8231d6589eb12846cfdb10f83789da3b9150
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=the+croods+a+new+age+torrents PDF link annotation
    • https://consultemergingmarkets.cubsindia.com/files/lurigesavetaselirutebuw.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/433f0420849b5db875a22e97f93f58db/gibawujukusefogabe.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/71448857768.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/36801190380.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/kixasuwegezowivipor.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/fevigebipelakalimuf.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/wokodasalukasofijiga.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/divusenepoxonutilorugobam.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e4e2fd50---35051186222.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/46418687351.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/bagisamoponenigixime.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/32002305300.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/xafabefolirafosojo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613093a56d7f3---49178332249.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/sigejujalakozikug.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22469467060.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa1d8524f---14388680443.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/xesagodutekax.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/kuralidu.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/40098549398.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/vagovo.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/76128404944.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/57802551684.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/95581428506.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/44725145363.pdfIn PDF document text
    • 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_off0000c793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 17088 bytes
SHA-256: 2d12ed40b11de32fbf0e0c4abe15f59cb082afc0a8dfb16f9c9bf7a7c3eee19c
font_02_sfnt_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 10560 bytes
SHA-256: fa5471719a80821bbe6ce33bc2d1af35ef74670fb63c1a9091fca8cfcc061f97