Malicious PDF — malware analysis report

Static analysis result for SHA-256 220c4e15e5aaf5bd…

MALICIOUS

PDF

81.7 KB Created: 2021-07-25 01:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 795f7b2c8639a34f8461bcf02d42cf35 SHA-1: 5531bb91d956d86755eefcd205cc70d47ff1cdc4 SHA-256: 220c4e15e5aaf5bdac9a53381dab8afc6ff71821c88f221902ffaf57292b317f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of embedded URLs suggest potential for further malicious activity, such as downloading second-stage payloads.

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://seednseed.com/admin/fckfiles/file/guxiperoro.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d6b754c38b286d605afb8bc86e5f5a64/28097157147.pdf
    • http://sclifeguards.com/clients/16854/File/59313713252.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a98b7fc7cf0909b74373d13ad4dfe00f/tatunozimivowovadopikuto.pdf
    • https://alajuusa.eemedia/contents/file/994641607.pdf
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/87782441407.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/qgrlnr9khon8p8o3sfjkv1feob/26771481415.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/voxulenetupilavom.pdf
    • http://chretkinia.pl/userfiles/file/fodopaduzirexumizonunage.pdf
    • http://btc-ltd.com/upload/file/55688301189.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ff5c4eaf0ffc498bea06d6c4be39f077/kemafonofalubuvazuteret.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/495bc05266e0a49b1ec9936853d2b0d2/niwewoxexuguzizow.pdf
    • https://pmeds.us/userfiles/file/jigulopa.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c86087b81cdfb9d8e55051b4d576c0d0/23130181776.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a1f4d331dec451930d6e2ef3a9c0c14d/dajof.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4277efd1c38917c7a1e2450c803239d6/12502716144.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c5caaae2031420ac5881e64d5f873848/63053709576.pdf
    • https://nyirfa.hu/uploads/files/37103387517.pdf
    • http://aeronautike.com/userfiles/file/junosapokanovili.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090acc1704fc---nupalisa.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e498e47edf---sapivaxovelin.pdf
    • http://ghgunclub.com/clients/f/f3/f3036db30fa8ed97f94f648fc77c1040/File/gupefumovebarekenenafafi.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9073853dc8---53951468745.pdf
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/ranobe.pdf
    • http://rentaruedas.com/files/others/9973477128.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+much+is+launch+trampoline+park+per+person
    • 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_off0000da29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 16792 bytes
font_01_sfnt_off0000f23b.bin
49f5ed79076690cd99fbbecddf2e04be0aa1c638f409a86fb39461af3e53514b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 17276 bytes
font_02_sfnt_off00011fb5.bin
fd5b963a4af4a522a7051764a9219824f94bf8c4ca5bb8240858c22dd864a66a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 10908 bytes