Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20c0ab83e7e104e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 23:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4cea40b9f7a01563824aa017c87947fe SHA-1: 14797de84691484677200b5afc2867c3190acd8a SHA-256: b20c0ab83e7e104e9f4e36c72a2533d3c1b8f81c80dafac88d7705c0e690a269
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded JavaScript is likely used to execute malicious actions or redirect the user to a phishing or malware download page. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724322454d0---62491426750.pdf In PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a77217fa20913d50d630877540d3e63e/60444600827.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/buzibejofenikapawisodo.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/34049448706.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/gudeb.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e408650b76a7039cf342c3d6b6720d27/tobitozefusulasadidijex.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/2cab2ac74cfb0fd89cc0cffbfa780067/19254370264.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/megemajumojenojiwolewub.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/6j17s8648sj6o55jtga34jpog2/3861986816.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/19675774173.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/24957819299.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4vgq3hdd67gev6ctalop8ingr8/zotipa.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/15156282819.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/77342362416.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aeae3be84---30708275862.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/14467215699.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/gezaligevo.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123aef0be733---3243701797.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/doliduvotefupadavuvef.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3227206c9---radujomoso.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/55924539781.pdfIn PDF document text
    • http://zuche0551.com/upload/file/48203549943.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/5078483409.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed357ac3ef---duwidunujexunategale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=up+b.ed+entrance+exam+2019+syllabus+pdfPDF 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_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 18192 bytes
SHA-256: f9bf9deccfbd4701d0976f5d159fa8e3731bd075a2ccd51c6f2a951949af3ced
font_01_sfnt_off00011377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 11560 bytes
SHA-256: 5944ba51d9bf98184f1ecf376dde6d86d38ec5bb3485c6596550fafd0e57406f
font_02_sfnt_off00012edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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