Malicious PDF — malware analysis report

Static analysis result for SHA-256 4621de3a86f0ee19…

MALICIOUS

PDF

136.0 KB Created: 2021-06-28 05:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6a3b047fd68464eeb715f149cb56e42 SHA-1: 5b049d6d00a1ccef0310e3242a81c5d25e5505fe SHA-256: 4621de3a86f0ee1919da20e33e59f58672c015617bb4009a1f2f194a9523cdf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9427

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 https://pistant.ru/uplcv?utm_term=the+quintessential+quintuplets+animation+studio
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/92763197575cb524c42dcfee8253d49e/bajebukupuliwokisij.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/37d85c8327fb958b0fd49f2d2d7e6ab1/59835306059.pdf
    • http://www.niziointerior.pl/upload/file/45163419601.pdf
    • http://giustizianuova.it/userfiles/file/87105688431.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ad5c925771f26e7f292af338254d346/17047695798.pdf
    • http://coffee33.ru/archive/file/xejuruzalifijoz.pdf
    • https://recapress.com/ckfinder/userfiles/files/woditoz.pdf
    • http://vector-luczak.pl/new/fck_user_files/file/xuwoxisiv.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gijevemajo.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ba23e90ee83---pezuxokukupasavavusilex.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a3bab28b95afcfd19b6978a687e120a7/29036655495.pdf
    • http://emrc.ie/upload/imagecontent/file/tobalilaxatukowiw.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16085eb01462a1---86944325699.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b03662e89630b7c8d0775a59334612bc/bulurajemujibududewewevi.pdf
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/wuvozibiz.pdf
    • http://balogmihaly.hu/UserFiles/file/47643118233.pdf
    • http://imhkayseri.com/resimler/files/vekidozabuvu.pdf
    • http://hwayinn.com/image/files/20210608_204221.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/69d1ed0f895ba9feb59db968d6af8055/80431322408.pdf
    • http://ajtoablakcentrum.com/_user/file/fivobidevakuj.pdf
    • http://www.irrv.org/uploads/files/16962546323.pdf
    • https://amd-export.com/site/upload/file/voxavaxominasum.pdf
    • http://barcabianca.eu/upload/file/pokufolagesivemekok.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/696ea53befcdfe5b20faa36ffbc200cd/webonakatoresamudozeti.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb115068f6---wajerobapax.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/883514de71ab141577b8ff13448aa309/vakubupuvabo.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001341d.bin
2ec15090443601702dc4ac13aef0b0985de7646ccfd8f8264b8372b1188f3287
pdf-font-stream PDF embedded font (sfnt) at offset 0x1341D 18152 bytes
font_01_sfnt_off000162b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x162B3 16792 bytes
font_02_sfnt_off00017ac1.bin
d5b4af65f1713308c644097963a356c709932a7df1e79d4150b285f303acbd52
pdf-font-stream PDF embedded font (sfnt) at offset 0x17AC1 45960 bytes
font_03_sfnt_off0001f90a.bin
5985440a0c5ad241d60e38d31aacf1c6390082e4b55a9df498883773015f4cde
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F90A 10764 bytes