Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae333e4330774327…

MALICIOUS

PDF

92.7 KB Created: 2021-09-12 17:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7d8876730bdbaf6e27f1e37babb8789 SHA-1: c32c0f770543390e4297669ba9b0707c0c549d6d SHA-256: ae333e43307743274dcba4b575788821cffcced75eb2ab08ab6e6412774d3472
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable hosting domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://crysiq.ru/uplcv?utm_term=how+to+transfer+files+from+android+to+mac+via+bluetooth PDF link annotation
    • http://sportschoolindex.nl/images/uploads/zolijo.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3faa79362d6bd437024bbc89ef64c5e2/xemozelukavevusoduka.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/mofuxopixajiwebitujagojeb.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/29743581742.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/2130408646.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf4bbdc39c---97380877303.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/12365339034.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/pimabagatop.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/65107715787.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/lekudixo.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/35933818239.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/jufojupuzoguduwexozafaker.pdfIn PDF document text
    • http://soupworld.de/upload/file/45676957743.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/42856680026.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/lokuparaxad.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/842c4436baf5bb077fe19435a8537b0d/13809128618.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/87708338826.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/21162535396.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/75850080463.pdfIn PDF document text
    • https://citronel.com/userfiles/files/nujewemadegofasopijuwelu.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/xelolukim.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/64216279718.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1dc228831---mavewakonibojelav.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/bekilabumavod.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/53075204335.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/693668873613563387dac8.pdfIn PDF document text
    • 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_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 20444 bytes
SHA-256: 49960e0cca34b0da63326ad837b938f09734496a9778bc22389b9d519c39ebd6
font_01_sfnt_off0001323a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A51 11124 bytes
SHA-256: 87488950353a2ebc30b347db18714a803d37bb36adde95d4a730d89a6cbf4ee7

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