Malicious PDF — malware analysis report

Static analysis result for SHA-256 7321241820e9a87a…

MALICIOUS

PDF

87.3 KB Created: 2021-07-14 03:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e98b9f62d9d5764bb5759c9a4fe000b SHA-1: 1204844171f7eb3201bb4dd667b8cd7d96d276f7 SHA-256: 7321241820e9a87a9577716bcaef716ac882e98a1d7b0b78985b0da72e5ad741
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS uploads and 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 distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad6dac9c0---kaxegatijakanavujepov.pdf
    • https://olterus.org/contents//files/bemalawavaturiwukeforo.pdf
    • http://okwmd.com/upload/fckeditor/file/90316407741.pdf
    • https://siam-royal-view.ru/data/files/rusav.pdf
    • http://cuanhomkinhtoanthang.com/media/file/27104881612.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab50e08fbeb---94226777580.pdf
    • http://paoladebenedetti.eu/userfiles/files/mitovifirajose.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/k7dg543likju9ke2gpjv917j8l/punutamilodoxifusudetaret.pdf
    • https://bititechnika.com/uploads/file/mufuwunulezalogedomesowob.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/82c3f2412c0b82a39004c956e4fb4edf/95624276166.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6bd0ef0203ead16e181565c27c893701/dutolijufawemupejo.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lodaxijive.pdf
    • http://staractivecollection.com/resimler/site/files/60284803373.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/817debed66c2d2bacfc0b07b78057506/67865350587.pdf
    • http://capmar.eu/userfiles/file/puvubusodozebi.pdf
    • http://www.mediagrand.hu//data/editorfile/zuwutevivamoxufaxaj.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef721b0cb---38433025974.pdf
    • http://yejida.com/userfiles/file/rezulitifokivet.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/638515287.pdf
    • http://anandtouristcorporation.com/uploads/36268856159.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/zatuxubekanisugulejod.pdf
    • http://amghanoi.com/images/ckeditor/files/zajaguzogemono.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/52211193040.pdf
    • http://beamstraffic.ae/amb/userfiles/file/rovesim.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+delete+outbox+mail+in+outlook
    • 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_off0000f0a6.bin
e83776b5d071ffb720864fb3d0139792e274d979341dfbad86a5a2f595f068fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 10652 bytes
font_01_sfnt_off000108f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 16792 bytes
font_02_sfnt_off0001210a.bin
33466249ceedf97948ac1a72527b690ba9324052c6d9afd62c41d0275f45537e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1210A 17836 bytes