Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f22eea7e498abb8…

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 21:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88c55417d4d5ecef884be482bf5dea0d SHA-1: f7895ade820c1b75169c68960ae69fa570ee746a SHA-256: 3f22eea7e498abb8290d21dc6112733ed0178b500687168f6bb2540c0b38fa7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pasarantogeldua.com/contents//files/pewudovibesezi.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e03d5e75e772155ffe6caa485f9a6bf1/nobazozi.pdf
    • http://classicalgardenornaments.com/uplds/file/vededetamisugav.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325093f941---zogitabapu.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d2c40ae7ec85a94267f1210acf5fd6d6/zisusodarodidunesu.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/41694840358.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/6pa0n7k9cpf56puhnuu1ga7028/zatotawalez.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160accf8ad2eda---vojulidumixemifelux.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c64afb51149---soponosuwuriv.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/08rc5pgsvnc3kg9ni4g6bsr7r4/fenejulajozep.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160baec9dd692b---vatunazisazu.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9ef51643f---fezovuvatazimekamege.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/cbee8m1njc8uv7oot9vgehfdqi/97068863282.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7aad70427---risewelap.pdf
    • https://ludifrance.fr/userfiles/file/2529982858.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160740bed7a614---rejaw.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/hc2835qgh743t18t3uegqt23fc/64493304042.pdf
    • http://mldinsaat.com/image/files/zopuzipak.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ad94a6f07d802e634c7af74d9bf477de/57500499232.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/c7fac48b5c4335e51d8d4e2c048b1699/61342924779.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988cd1b95cb---fibininuzolega.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=lunar+chronicles+coloring+pages
    • 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_off0000f501.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 16792 bytes
font_01_sfnt_off00010d13.bin
c82c98d0d321bba7d46b5035dee2150b91d6c22a2cb2cba2282720a509802577
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 17064 bytes
font_02_sfnt_off00013959.bin
0802b04b27db4bdca329addad809bf85086286b260f751d195eba28b82f547d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13959 10612 bytes