Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1aa3a1ee804ed9d…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 02:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc74e0c7dced1bc8ba09d3d390c228aa SHA-1: b2e3b881e3a19667ccb979b639c98d1c33eaa5d4 SHA-256: c1aa3a1ee804ed9d487ef504467e7b8fb2e42496901b91930d3f42aebf3fffc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting. These links form a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=what+is+app+drawer+icon
    • http://qataminational.com/uploaded_files/userfiles/files/34219504701.pdf
    • http://rigosarchitects.gr/userfiles/file/79771037950.pdf
    • http://ilkjv.com/Images/Media/files/86310681532.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/46867873246.pdf
    • https://calson.garment-pro.com/ckfinder/userfiles/files/66554277594.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161370d6aac9e8---wekapefefapid.pdf
    • http://sabaispa.net/userfiles/file/83860626328.pdf
    • http://purofirstli.net/userfiles/file/wedugopafewezuxapo.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a201e0a025a46c0f8446cccd4fe15a7c/52314481578.pdf
    • http://synergienetwork.net/userfiles/file/50877549812.pdf
    • http://pcccphucvinh.com/upload/files/64332704081.pdf
    • https://bczenekar.hu/files/file/23302564802.pdf
    • http://carrozzeriardue.it/userfiles/files/linudagazarezime.pdf
    • https://kuraniterbiye.com/resimler/files/rogudemuxepilenu.pdf
    • http://nhagiatxanh.com/public/default/ckeditor/files/zirodedatofatavolozuvivan.pdf
    • https://www.hsbofmn.com/ckfinder/userfiles/files/zetokifokusori.pdf
    • http://www.herbertvanderbrugghen.nl/draft/22232488907.pdf
    • http://wingmanresearch.com/userfiles/files/figaravukona.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e01b5dfee---13047958641.pdf
    • http://immobilieninvestors.com/userfiles/file/81191643507.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/bimuvivonu.pdf
    • https://fengshan-zhennangong.org/upload/ckfinder/files/85583660537.pdf
    • https://smartcirclegroup.com/userfiles/file/gemeduwu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F7 16792 bytes
font_01_sfnt_off0000dd0e.bin
e9dc8aa46068976e1654f5d3b93b0287f03596c4eec0c3623c3ab5ad19924b65
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 10644 bytes
font_02_sfnt_off0000f572.bin
a2dca105c4f11bfe8f89ab0ca1325166e05e6aa9ca052bcf4f92b02dd704ec5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 16604 bytes