Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aec072e942793c6…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 18:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 385c3abcb73ae0355861f0c402cc5db2 SHA-1: 64b59a271a93659ffcac31227151acdea655085d SHA-256: 5aec072e942793c64ebdcdb95827958d9e3de772659f60a00795ee9b07e1d80d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, serving as a lure for users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://allytemp.ru/uplcv?utm_term=pdf+drive+online+books PDF link annotation
    • http://www.greenfield-sustainability.com/images/files/10050020040.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/sididezavexup.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/buxom.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/wemilizegov.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/32023518659.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/48686308787.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/61227112302.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/72023858692.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/ganaxidufonuj.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/82250975045.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/zojaviroxesujudapo.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/sevuturelofo.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16143cf387e32c---vebapebunudefedeseliwos.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/57929527453.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/95532764338.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/46230738184.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1af505ed6603d4b22665015ee2a07971/nalamagoga.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/2362903874.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/60638883480.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/fipolubowebax.pdfIn PDF document text
    • http://punaide.com/userfiles/files/sawidud.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/83174880438.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac379e080---44468270685.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a7fa1a36bcf327d1cda4daeab3cb82a9/53331118659.pdfIn PDF document text
    • http://garderoba.sk/images/_file/kovapaleg.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_off0000b2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 16452 bytes
SHA-256: b22e6d1006e69bb5e986a1924076d99f9f5609d8dd7b48a667f9b988d8963fe6
font_02_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 10384 bytes
SHA-256: a658a3436d41e5d4c7a366758a1968aea9611d2246a9dc30c51610eb978aad3a

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