Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5624c7c15555de…

MALICIOUS

PDF

81.6 KB Created: 2021-07-17 18:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5f494f18d969c89de1d01b03b1740e1 SHA-1: 210b75ab2e3858bf969b632393088128c7a6f68c SHA-256: cc5624c7c15555de22ff1a93be8a46ce88bb1904db7fa299aed60cbee4735f77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL findings are sufficient to classify it as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4e9a86679d9116f89397ef7476558b54/2819491033.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7c00a72fac0d732f4646edd39ae8baea/junizapiruwilow.pdf
    • http://standartbio.com/fckfiles/file/wawivedasuzedinepamapad.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f2385ead---guwupinibiv.pdf
    • http://immobilieninvestors.eu/userfiles/file/nalosukofigeti.pdf
    • http://bronia.org/userfiles/file/36951183144.pdf
    • http://beveragesgs.com/userfiles/file/poredusitupiruwosomin.pdf
    • http://evohome.pl/userfiles/file/65448725285.pdf
    • http://www.colormotion.cz/UserFiles/file/rinuv.pdf
    • http://lapawan15.com/shop/fck_file/file/xezijefibepefurote.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d19b347343faeb4faef5d3afe2690577/dejolepelazababebogilime.pdf
    • https://alperbehang.nl/userfiles/file/jevixepivepurapopituxe.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c9b98e17---zoxerefulewalukepog.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8ddac11308fb514fefb8eba0b14d852f/56757654781.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/03f6b52458917346ad4bc907dc9870f9/butagojixamosi.pdf
    • https://guapa2.com/admin/fck/file/9463333690.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083518cc81c7---17778742078.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/p8v7vob5tgabb4h6982e70c4c8/jubirisisatoteroku.pdf
    • http://geose.ru/userfiles/file/96317165390.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/207125564660f2f72323416.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd0314c6b---xitaralog.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f4b3816893---3888368312.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c9a4c089b2714dfada45adabe11402c0/479436263.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/b846d986049d77c171e5aa04120bbc25/64673172577.pdf
    • https://bursakaynak.com/userfiles/file/kofipazat.pdf
    • https://energooptima.hu/upload/File/woturunajumigomizij.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=red+short+almond+nails
    • 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_off0000de01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 16792 bytes
font_01_sfnt_off0000f613.bin
f82a7b296827df7837c99134e78640c8bf82caba6e57f0fc002be0596c9d6230
pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 16680 bytes
font_02_sfnt_off0001216a.bin
3f82b11aa24c5d9ad976e2135779f5fafc531e64c2ee8e39348878cb4be394e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1216A 10556 bytes