Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7f773ab286ebea…

MALICIOUS

PDF

83.8 KB Created: 2021-07-02 09:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23426777dd6930e41450c4c53ffda7e0 SHA-1: aa82d3338494e7e0c3242eba9ea704735d1690bd SHA-256: 5c7f773ab286ebea11a6efbd9ec3185c13fa3857b7acf38bc423ed386669db60
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites and disposable domains, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous links to potentially malicious PDFs is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://bititechnika.com/uploads/file/vavipudobo.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/3377560935.pdf
    • http://burrburroughsfamily.com/clients/55468/File/53152293270.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160819504d50d0---gifonexo.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/34qqff7r926qu40dmbo6n4g587/zojuzikidosaxoxaxa.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090c9ae969eb---fomipafi.pdf
    • https://deesudcoolingtower.com/userfiles/file/lekigimuta.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9f1a02e1---92079019872.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb03f4308d8---80146236564.pdf
    • http://asbu.net/uploads/FCK_files/file/40028671878.pdf
    • https://istocdukkan.com/userfiles/files/53715525680.pdf
    • http://vanxuantravel.com/upload/files/wifasagaf.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b49950002f2d6475b6ea34d1344b7b9b/12744568661.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3433b3d80---tobibokudijefesezo.pdf
    • http://pensionpoint.cz/userfiles/files/4110495655.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/70276236191.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cd7e3c95a---49503892520.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/35632233449.pdf
    • http://fogathajtohirek.hu/fckfiles/file/56684083067.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4843a0c593---73686487525.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d310941c316---firopavosize.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/8f88679e370ce622b6dd2a1697242250/91058955408.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ielts+reading+recent+actual+tests+2019
    • 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_off0000d4b4.bin
750db21a65da1bb79b17d8a274a943faae85bb277ee1afeedd4b3e965aaf2af8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 30116 bytes
font_01_sfnt_off00011048.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 16792 bytes
font_02_sfnt_off0001285f.bin
d5c1b9d7178d8d0b2140f5a1f5181e237678ae75dd2ca4774fbc3b08fe6de81c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1285F 10936 bytes