Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc475d5b5b4a911…

MALICIOUS

PDF

78.3 KB Created: 2021-06-25 14:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ea16e671be234ddd202c39750a692d9 SHA-1: 70592b0f79445349cc2420aeb5da348c57592b52 SHA-256: ecc475d5b5b4a9112f4c63a6b97515d488f66051044c649571ae723163fd9b1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many hosted on compromised CMS platforms, designed to lead users to external sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging strongly indicates malicious intent, likely to phish for credentials or deliver further malware. The 'utm_term' parameter in one URL suggests a lure for 'among us game download', indicating a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54123876171.pdf
    • http://utuin.net/files/fckeditor/file/6155105149.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d550edda---viluwefutemakelizibew.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/m1u3jtq0ce74gg3mkfr0ea8nbt/vibemozagibire.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28038e7713---wememoninotufiriz.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c715f53c1e9b2569e4e60f107ab6da71/ferozipisijivun.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0176ff1b25---wegufogafejulitofinef.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a08113f0d8102a830d126c6f01099235/mopijajoketamuwuripaf.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/lejoxozironisazumekod.pdf
    • http://werder-ritter.de/UserFiles/File/56195143273.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086888829f40---rirotikibof.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822127960b9---70734630909.pdf
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/pepukasimiraz.pdf
    • http://pusheng168.com/uploadfiles/20210618213130.pdf
    • http://championshipsportsrings.com/clients/23492/File/puwavalekazebidafojixefa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=among+us+game+download+for+windows
    • 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_off0000cff7.bin
bb6a52b5747203be20454736fa3ebd42d9eeaa8132132a0242ed8df35617f38f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF7 10764 bytes
font_01_sfnt_off0000e892.bin
41d42c3858c40314fe4a65815f858eba4d4980a25b83b29c50672f9863033021		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 16380 bytes
font_02_sfnt_off000112cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112CD 16792 bytes

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