Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c64ad2c49b15b0…

MALICIOUS

PDF

72.9 KB Created: 2021-06-29 01:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16a59caf7ed3493cd200c70168fb9e65 SHA-1: 5f172bae3be13708ffeac3307d0f97ce4a30b630 SHA-256: a7c64ad2c49b15b0f12707c7af0aa9afe1f38e16e0153b3953cc882b5ec3fbee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised upload storage or disposable hosting. This suggests the document is designed to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://dianacb.cz/userfiles/file/nomigabapi.pdf
    • http://whatdwellswithin.com/file/74658476715.pdf
    • https://familienbilstrup.dk/userfiles/file/lejetaripokavegi.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985fe4cc204---rujosi.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ada88d9b18b---30214422807.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/4186226540.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/56ec39191f80cc4c501495c4480d35b3/fodisufelotogerugir.pdf
    • https://seikai.jp/free_images/files/37039878687.pdf
    • http://abpaluso.com/upload/file/xutuzivekasat.pdf
    • http://amon-syotengai.com/userfiles/file/16058057524.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/689b3f2480c7ec4b07654b2fe0a00057/vuxogeziluxubozok.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa7e463ed8---parewamasolobuneviwotumaz.pdf
    • http://jhferry.com/data/fckeditor/file///21351604354.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da43247234d---jodusob.pdf
    • http://kaizousha.com/js/upload/files/16188829727.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160826b765a7e0---ruwuserexipepuwigalo.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c101ec0280a---genumojazoj.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a384e51c21---gelavafadat.pdf
    • https://bbmint.com/userfiles/file/399604126.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/bagogajazifikigariwo.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8439cc27bf---lutetasinexewe.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/5f98df6a8a0ef4e8aaa4213c243f6b06/62945279341.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/75488061665.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b456de298e1---bekefavewunijodupadi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=james+stewart+calculus+7th+edition+solutions+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_off0000bbc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC5 16792 bytes
font_01_sfnt_off0000d3d7.bin
752d3d6770281894271c89b2632f6cba536048c7579b16ea957642ffee358c78
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 15800 bytes
font_02_sfnt_off0000fc52.bin
a816fbe22e6595968bd4ce2e4a5918aa094652e7217c4b43bc7b367998268f46
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 11112 bytes