Malicious PDF — malware analysis report

Static analysis result for SHA-256 54214cf24ed19b9d…

MALICIOUS

PDF

97.4 KB Created: 2021-08-13 09:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 664722b0d26ff5ca32a5c66b18e95347 SHA-1: 8eda3348e8591e5e4f309a15a851706f09aaebd1 SHA-256: 54214cf24ed19b9d72a80f1c0425396056cd0f6d6953c0ab12228a19c7ce812d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://halmar.info/userfiles/file/65159381888.pdf In PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/3cf8fea28611c87c79b60aa5d7bbc6df/12493762455.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610c358e6ce77---81061009360.pdfIn PDF document text
    • http://agrion.org/upload/fichier/73772454936.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb0f6b13b8---zunoxijezezezi.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/41380408212a7e322506c21755df537e/xuren.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/41528153736.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/55885465262.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qiaejlu6a98d1pvjvcp0qhmv3d/300559749.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0e2b6ff79721384f7aed9eee60add99/69091909446.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/rm9lm60938d65m73s1ojdgkmt3/30885637173.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0cafc146bbddf0a34a1ef97ac15b352b/97155920615.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2758c7f0f9a4d76761c6a8f04756d9d6/95044866712.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d02c807b4004a047a08defbdad4e32bb/62125758688.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/20369937655.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/52358752537.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607946dc9025b---85411925549.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5a7a56a8fbff077d0b2a3fcfdea8d19a/27488106755.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fasoxer.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/lajorepug.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/rovuzidijofed.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/21326495837.pdfIn PDF document text
    • http://packamate.com/userfiles/neramalokonirujamujir.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/db649ec28f0e36f55ab08fc99eb0d046/depijoziwejedujak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+veldt+pdf+bradburyPDF 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_off00011b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 10496 bytes
SHA-256: 0060f197c746a45ee5eeac0c3363597a8055b1310e9cc522827fb1bc49d15bc4
font_01_sfnt_off0001335d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335D 17100 bytes
SHA-256: 60ba81f8aca70e31be992013ff775a5a00d216c0166ead5b756b242679c2a0f8
font_02_sfnt_off00015fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1