Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c028c34cc797ae…

MALICIOUS

PDF

89.7 KB Created: 2021-08-12 11:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39f3e4d1c781cc73a6b4a49836df2fac SHA-1: e00084a90ddb9512f746a531ad87fb516552dc07 SHA-256: 69c028c34cc797ae573595cbc10c08b965400ddc68688441ab8370777be121c5
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, likely intended to direct users to phishing sites or exploit kits. The presence of compromised CMS upload links further suggests a tactic to host malicious content on seemingly legitimate but compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://laborke.ru/uplcv?utm_term=adobe+acrobat+xi+pro+serial+number+list PDF link annotation
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082014548758---96626832117.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d727640d5---41348424696.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b650e7d8fb---metagune.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3qalnbron7jtfd37mu34ituqs4/neludobupuvaxusan.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/fegolexitafawakusin.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/20664879643.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nc1ho3u3nqitdd0vjdbjr4alk6/pametazepulejap.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/63779619470.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b986124c---75658286094.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/zapewapibavadoje.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/24593903257.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5a2e1b5fdb956057a9d98a60c4c5b1e1/98240278247.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c551335a1dd.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/46448848372.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/53825641491.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d6ba3fb3---80146776992.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/85017206375.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c9756c064d778728a76a6f275822949d/13130470381.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/ponutejawolevawujumesokeb.pdfIn PDF document text
    • http://linza-market.ru/upload/files/32005849218.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/gonugobetufezotis.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/f034b1daa5d2ec54e141f2e21b462797/zotiluzafarekubasejuzomi.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/lerotuwepize.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2a5ee2b3249563c802905637dbc9fff9/nozoze.pdfIn PDF document text
    • http://rilta.net/userfiles/files/bitafamotesukisi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b3bcb1530---24423763135.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/narivinajefawufafil.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/5280509796.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_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 10996 bytes
SHA-256: e2f2e448949c7d55a1bd8def89b7213547ee35a9442f9c79b196850acd7fd945
font_01_sfnt_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 17784 bytes
SHA-256: 5c8e2642d149565ab126ed3c5343c85701f31be14eba783034542487a8cdf259

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