Malicious PDF — malware analysis report

Static analysis result for SHA-256 a780167820fab96f…

MALICIOUS

PDF

80.5 KB Created: 2021-10-09 09:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 78a50249fa2b1bb17129b8568552032f SHA-1: 41b62e62668ac39edb523cf9bc69e34e065e1112 SHA-256: a780167820fab96f6e34c8f98a51e3a2708b88619b5018b207f24862df92a398
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to compromised websites and disposable hosting, suggesting it is used to distribute further malicious content or phish for information. The embedded JavaScript stream further supports its role as a malicious document, likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=feasibility+study+project+proposal PDF link annotation
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/95504349222.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/zevago.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/pumogun.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/mitigejukis.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/medet.pdfIn PDF document text
    • http://szpk.hu/_user/file/27352502500.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/74093376450.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161469d491fbf7---25269832163.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/xovabowamigugefun.pdfIn PDF document text
    • http://autodilygood.cz/files/file/80504713704.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/serojifeponovon.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/30571230220.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/62085637612.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/23626697391.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/wirabubibenurafinatuve.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/dd5c50d5c0dd7ae226323080f0b71791.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/zuwumoma.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/52e9b734a280190913636c4bc3e5c16f/15289495926.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/nujexegijenifin.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614742754321f---titutidima.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/furajexivasagebap.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/kukuwaxopi.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/2681746183.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/fuliwidil.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/59860dfab2d6447f79864efe75b8eb2f/86091994878.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/ruwuzekagodirujefimof.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_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 16396 bytes
SHA-256: 41218e77aaa097177b46ed6935e0a593862362609ea96ee4c2317e89a1794ad4
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 10864 bytes
SHA-256: 1ca0d2d30cef364cfe818aa1ac34c6238b86366f79650a2a492a1684aadab1f2

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