Malicious PDF — malware analysis report

Static analysis result for SHA-256 9581e87d055cfa2d…

MALICIOUS

PDF

112.3 KB Created: 2021-07-27 12:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 981768d96dc621581183752046b1580a SHA-1: ec57b9c60f83abab27218a3b0a754ab09b1b45c8 SHA-256: 9581e87d055cfa2dcd33bcef8b165d37766ed80b2fa6086e989f4df71dd64d1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://614move.com/clients/4890/File/jogiv.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd8e49fc5e---12503539394.pdf
    • http://strategie-online.net/catalogue_dynamique/file/52595379747.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cb923c2fe---75812556339.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/e8f79a22c33e1d89945b7d581477b0fc/wapenisovuliwisakif.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b292dc9e1c0---25611220707.pdf
    • http://epoxidice.ro/mm/file/pefamefubugurozizikimur.pdf
    • https://aksukartela.com/images_upload/files/34079010854.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qkk2n2c96t4gff7ji6ttokvjuc/96118009022.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd006287288---25037626928.pdf
    • http://robwalker.net/fckupload/file/89299544413.pdf
    • http://www.prieteniitehnicii.ro/documente/file/xidukadesebabarigi.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f28557efd8---zotavop.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/phdfrtfgian8itkvatgrqoiq73/bigonenoxonezegatevirole.pdf
    • http://thuephotocopytaihanoi.com/upload/files/38836676503.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8bec3ffa13b083841bde82d68511ed4a/timuke.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3be9c73e---loziligovaxabubomoxeda.pdf
    • http://ibtaker.ps/userfiles/file/vuvafadafirosusigamug.pdf
    • http://moderncarrent.com/user_img/files/48654487985.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16098693dcaaaa---33862250839.pdf
    • https://alatheir.com/atheirwsfiles/file/mogajux.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cf80e0102---94447218108.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/gowofikunulowumuwapede.pdf
    • https://mariellatriolo.it/public/file/riwis.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nuevo+formato+certificado+de+origen+tlcan
    • 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_off000152cc.bin
8e355a6055d92783ec07fda67e49b6270e769a3cfde9309a99f00852e3bd4906
pdf-font-stream PDF embedded font (sfnt) at offset 0x152CC 10796 bytes
font_01_sfnt_off00016b76.bin
f1c616f611b178de34caf19c1935b2d1e2f10941c18d0eb7e66f6c9e3690ab20
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B76 18676 bytes
font_02_sfnt_off00019b3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19B3E 16792 bytes