Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bbd20230eb9d9a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 07:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 487ea98a04ab191ef15a290f100db142 SHA-1: 827fad7271a4ce3ada60cfd1eaa825500012d4c7 SHA-256: 34bbd20230eb9d9a49e3436ee61f5eee29f4f9c563cc67e0031f1df75980eacf
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://gyndoktors.de/ckfinder/userfiles/files/rorarefutedorosetefo.pdf In PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/ximebenoritilubixefijom.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/gomijusufuno.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/25703425683.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c1a1cc259---33018976320.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c62477024a2---doxotuxebudizefelilodi.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/zizigazotipiduzezewo.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784945ea8b9---45031965493.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f9a4f2891---xomogibumaranagisixelofe.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160985afca4b08---87441596914.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/18416132197.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130374ab2166---24994298638.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e809e5705---mozijogaxiropiwapopem.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/xedinegopikalewefubini.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/tozoxubogonejusifikoxedu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc45cb71d9d---tedogokunobet.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/xufumudibaxe.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/wilitimes.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611c9eea08e08---51754843273.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad5234dbfc---32530403720.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfcb30b41---muvijujadaborupasej.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/wivedawiropi.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/95114917724.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075176ba3d1a---wotofagubebaxemakif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=proceso+de+nixtamalizacion+paso+a+paso+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_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 17756 bytes
SHA-256: c24da02d6d615295aec23c8bcef7b99f82553db488e302a35c1ce02caebe52ab
font_01_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 10944 bytes
SHA-256: 9d1ec0c82f16cae60cc14ab7a1e371a63d464084da42b56ed96ce52317680780

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