Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3c0d104462d8d4…

MALICIOUS

PDF

85.7 KB Created: 2021-09-09 20:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 432c927bab83aa3aaaf48c0cdc6271bf SHA-1: 3a5e05ac15c0b7a9e51a5f89a212f570972666ae SHA-256: bc3c0d104462d8d4134aaeabfe94039f13a8ddb4718f2db6a0176834601e487c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a high number of embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=best+pure+android+launcher PDF link annotation
    • https://xinpayflow.com/ckfinder/userfiles/files/32811522705.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16130ecfd04bef---41156706086.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/vejibaderisaju.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/japexosopubefojux.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/jivoxobila.pdfIn PDF document text
    • http://atrsara.ir/resource/files/16284497883.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/zokejojegavutariragudaxa.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/s9992et88dstj78vk6r29fssgs/karuzuropefimuf.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2b7f5e8df---69217697002.pdfIn PDF document text
    • https://hojoairport.com/images/file/muwezovorekizutu.pdfIn PDF document text
    • http://lawngo.net/fckfiles/babopemav.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/805252016f39c6b1a1eef2fd63cc3292/5009510736.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/modogegujixamegaditotuv.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161380b1214f02---taduxadowosetobosopexug.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/46092122728.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///zaxiloloniroxutekovapinaz.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/katili.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134950e5d009---vuvetepirebi.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/waxoxujazofinukipepoz.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/45946539588.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210905_3C764734D1E8818A.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/vamelunidakumanadev.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219403188079.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/50861522002.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ingcblm3fnnchcj2a87c6vhf20/vavazog.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_off0000e75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 18872 bytes
SHA-256: 26a420b467e8540601bb43082846f01a242b66ecbc86e89398e3d22103d30f2b
font_01_sfnt_off00011885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001309c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309C 10764 bytes
SHA-256: 87fd3ff934b1febce104907c7ad37bee8e3adfb46d05d859b89a076f1954b43b

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