Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ba72308865ff0b…

MALICIOUS

PDF

123.6 KB Created: 2021-07-24 12:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1182d0e34b7d11585eee292eebad8960 SHA-1: 6e10c695edda3a955a54c60f8a545216fbb50a0a SHA-256: a0ba72308865ff0bd916f6bcec88744e0ea9f453d6b9db174dfc7bfb746de589
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/irve2eicllj9dd5lsu802j3h2n/jegeguxil.pdf In PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/liwexusapivabakef.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/fba1af6990ed107689292df1c52b5f3b/seweza.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/32382819318.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/60123691963.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609a57834fc36---93979439476.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d68dfbfe---15331655623.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/jabeleradez.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e9337c5a---boxofidinaf.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/960f16fa1f1cb1617f2c4ee9b514fa71/nisojadujowosukiwiwi.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/arokirujomowusiwinibivur.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/372fbbdae9d5f6eff934a5ce87a1a0fb/bedetuzapagukizedokikaz.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/11911982957.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/87274006445.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/gogeliweregamebezugobigex.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aca47bb647a---nowusijasesiwagitikij.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e424b7355---42849308141.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f14550951d---denoleposuwaxemex.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/jenixoxobesusadek.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/n4fi06ojqusi6spa532jm0fcm7/ruxumuxawenabefo.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160efeb6ac3c05---pegemefogetobi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/8938c324968a05400e0415bf6d04ecbc/7438661141.pdfIn PDF document text
    • http://sns.hu/_user/file/11442337189.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/56614833366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=interpreta%C3%A7%C3%A3o+de+texto+com+gabarito+8o+ano+tirinhasPDF 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_off000177e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177E5 11780 bytes
SHA-256: c8068aa85af90e686f24e4caa69e003c472d58726fbccc7f191d345f3dce2a03
font_01_sfnt_off000192c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192C0 20040 bytes
SHA-256: d4ac23adef898cb5210089a8ce4b2e2259b7db2ec36dc8afaea60985e41ff52f
font_02_sfnt_off0001c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1