Malicious PDF — malware analysis report

Static analysis result for SHA-256 011c16ad3761e6ce…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 19:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d71c115923265992e5df95594e0a0f3 SHA-1: 6e2b05ac5ed983f6e54afd09984f72ecdf8d0296 SHA-256: 011c16ad3761e6ce1bb8a78c05e1c7aaf23afd2b7eae4cb2f789092b208ca195
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of multiple links to potentially malicious sites points to an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://irish-setter-zucht.info/ckfinder/userfiles/files/94003064454.pdf In PDF document text
    • https://macjiboter.macjahisa.si/files/file/88649636369.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/fusivojovola.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/xodixare.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/oo7p8dli8atnri1uvkqakh6ic0/baxobamedovulijudabo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bn7sgu3mlv4gqgrcqel8tto7q6/zuloniv.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/letazinekugamudekidafowo.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/40406733852.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/vekaj.pdfIn PDF document text
    • http://ledins.lv/cms/file/75500715798.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/63429546312.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/ratogukora.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/62555618653.pdfIn PDF document text
    • http://thaide.org/userfiles/file/ridugademem.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/917b124547ac1863f066c42870f328ac/41436795055.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/koxomoredani.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/xasafiwakotam.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/wexetibojesizixize.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/xazipexuxarij.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/67482448484.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/forixivajunojej.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/23212072697.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/kuboluxujiteguv.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f3e6fbc36981bba60ff3501c5820ac36/33509460014.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a45339abba---powaviradivutupegoweba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fl+commando+hack+game+downloadPDF 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_off0000dbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDD 18404 bytes
SHA-256: e443c322352018154acf579d10cd1c526e2bac96246476c33557f736e3abdebd
font_01_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 10512 bytes
SHA-256: 25328d53abb205055778f001dd74ad6f4919800488d2cd569d8102bf23031026
font_02_sfnt_off000122e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1