Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05b18b775ecb378…

MALICIOUS

PDF

83.3 KB Created: 2021-08-21 13:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0385b5a26adf05775c56d0f63ba56a5 SHA-1: 64a362fde14ff8872d17ec61f9f6db1ee4b623d2 SHA-256: e05b18b775ecb378d3c4fa93751faae186b28e6db918c3ca625bc315e5f54b5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document contains a link farm pointing to various compromised CMS upload storage locations, likely intended to host malicious content. The presence of urgency lures suggests an attempt to trick the user into immediate action, such as clicking a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vocembalo.ch/userfiles/file/xopevefas.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a67a8667ed---25649521983.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ifuo6qq1d98ul2vfgem5bv4as3/60726266254.pdf
    • http://vamaconsulting.sk/userfiles/file/jetunix.pdf
    • http://evolution-dev.com/file_media/file_image/file/toxije.pdf
    • http://hanabi-la.com/uploads/files/jotuxatiguvazafumusij.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/fezutaxaposisun.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c8e5e2cb5---10305451657.pdf
    • http://klpa.net/userData/board/file/79490886726.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb09e3ab51---71478135216.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161205916b305d---suwewufe.pdf
    • https://cmflower-kkc.com/ckfinder/userfiles/files/teruwegobukipijupidina.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/5971867696.pdf
    • http://15889163.com/ckupload/files/penoxefade.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/br7q0q70sm33ncp7q007gqpat4/92881326291.pdf
    • https://virker-ikke.dk/files/38224095730.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b23aa51ab4c---gakuxix.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f2aaeb434---6296030489.pdf
    • https://bocion.com/ckfinder/userfiles/files/fabupaxuwadulovu.pdf
    • http://aklond.com/UploadFilesfile///2021052518594480.pdf
    • http://files.ibiza-ferien.de/file/zekid.pdf
    • http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/negulopi.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/261d38426876f9b9b09ef168e56cd336/kisemidezanirolexo.pdf
    • http://thinhhoanggia.vn/Images_upload/files/vadamesebasebaw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tubi.tv%2Factivate+sign+up
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e213.bin
24acbd1c55c2e01a923d38f20c1e36d11853ce115854255611524096c805e91c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 16760 bytes
font_01_sfnt_off00010d90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 16792 bytes
font_02_sfnt_off000125a7.bin
752222ea2c4095c68900b78f2e6e1f9c829299f96a35a2a0a1a8f79f1a6f7367
pdf-font-stream PDF embedded font (sfnt) at offset 0x125A7 10652 bytes