Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be8fc9e7d427191…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 03:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87b02af4b11abfb8502bd401474be7fc SHA-1: 5a68ef20aeb91e229b3980bd509edbc6f04bee83 SHA-256: 2be8fc9e7d427191f1fea70537f7bb18f6cfff993d7796f76a05d933a7b271e7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised or disposable domains. The document body is unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

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://karate-talence.com/newsite/userfiles/files/kikevixapu.pdf In PDF document text
    • http://banghetretunhien.com/media/ftp/file/25458338584.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/45296788329.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/30491191176.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/26523713490.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/fezovanarerarelejibiso.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/57521360244.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e3c44574a---winukuwar.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/budorusilikax.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/tezatoludomokeper.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/7764697548.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/sadasadizulireko.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/wazivudiwuwekan.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109021004296632.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/20874711545.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ntpof85h9s740t18a5dlagn5ur/13556989080.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/nuviroforazuzurago.pdfIn PDF document text
    • http://newo.ru/files/files/99168650935.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/18684789885.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210919_A97B8B778873ECCC.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210914054350.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/tefusasasatuwi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/822d285f5e3c041a89e312f6eba1b0ce/talixe.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c80198649---wazurozokajumutujomem.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210903070353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=miui+12+for+poco+f1+stablePDF 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_off0000b55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55C 10776 bytes
SHA-256: 3b2125b1b2f34615f8fc703a3ff46b3297f6853aab04448bc72a28adbe6732e6
font_01_sfnt_off0000ce32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 16076 bytes
SHA-256: 40069ecc7e9ac4163a898eb809a93e55dd41211e50a6cf33147afdad59af5167