Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c76c554329e775f…

MALICIOUS

PDF

89.2 KB Created: 2021-06-25 21:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24bdf827206f2591d776190f1c1e66c5 SHA-1: 88f9658d3c7d446c10e6cbbb6a46b8b07b220abe SHA-256: 0c76c554329e775fef90b41cce7e90054f3c836dcbc96690004e4fee9d97f88c
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of a download button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/m2rqcmjeq82lnrg3m3dj6s8jo2/922278375.pdf
    • https://lienlacanien.com/img_pages/file/14741581139.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/r60e46s2bae3v2kpt81f7h7enf/jikibejowubuz.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a88d650b85e428d2acadb4fd9f3fb60a/96709961188.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/lohqmhp0r2og68fds5ufm2v7lg/37695454463.pdf
    • http://vyveva.eu/UserFiles/File/74855989247.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/al9hf441nvr850jhce79ih0dct/28981208757.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e36cad0c6---kovavewarobe.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790638c68c2---mudefuwutatedibuterak.pdf
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/94770272978.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/e5e37e6d2213000fa82c2fb11b163a53/vevuwa.pdf
    • https://alutat.com/data/file/bujasuwegowuxesumotiki.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/nkrimeromd9kljhoim1k74frfv/telanelux.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a1d9d9de5d994595ca9a93d3d5a94b2d/demez.pdf
    • http://erex.hu/upload/file/pefazarub.pdf
    • https://adepotcustom.com/UploadFiles/file/20210429092017121.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/5a69618625985113054937c6aed20c29/23787621427.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b20e44164a7e915297d4213c000ca107/78385364023.pdf
    • https://abofahed.com/userfiles/file/15247809570.pdf
    • http://firanywiktoria.pl/uploads/editor/file/10950273037.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/rotidirado.pdf
    • http://icltindia.in/userfiles/file/40946177219.pdf
    • http://rw-hse-businessconsulting.de/userfiles/file/25896735388.pdf
    • http://abwalabamaave.com/uploads/files/vanafarubew.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=universal+science+class+6+answer+key
    • 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_off0000fbc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 16792 bytes
font_01_sfnt_off000113d4.bin
2940a22aa464963161bb9b226859f7e8a95f9b8e7c1fd6b6f12d6a286c66d083
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 16712 bytes
font_02_sfnt_off00013f61.bin
2ddd854ac4281341a5cfe6a3e51c1f510e04b8308e1527a771b621e3b4d56b46
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F61 10540 bytes