Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c92fc52c4482a5…

MALICIOUS

PDF

97.4 KB Created: 2021-06-26 12:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7263fc975f8bbb35907eb04714ba042 SHA-1: 13247441c42b0c5354e79d39e9b131ca9ce102c5 SHA-256: c4c92fc52c4482a59b89021dc6b47539246d711a46a08561aa81e0a2f5d0f11c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and numerous external links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/phubduisvj11jnk84fjtia5of3/38299921891.pdf
    • https://creteservices.com/FCKeditor/userimages/file/87268189087.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49132cd053e7c749b003b9886fdd3efe/dibudojunofok.pdf
    • http://cedule-plachty.cz/files/file/tinipuwoneronorodelata.pdf
    • http://www.sport-konyv.hu/userfiles/file/bofefagimuzebij.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/009d5578b4b4830ccb8a8c495af2b723/92115351642.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/hs7uk2bds6nmkgntajfdesa8c5/bupesurulefujadejew.pdf
    • https://eletvital.hu/uploads/files/26934121380.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3smgo6ph3a1bu3gqsag9b2d2k3/94290738004.pdf
    • http://barksdalereunions.com/clients/869108/File/37056534367.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/repebebugolinezexi.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dee569a4f---3109221418.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077213dbfa45---wefobujin.pdf
    • http://rollfactorytogo.com/uploads/files/57508619370.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/j24qdh5mda0ueuj025fs7qp5ik/88648391472.pdf
    • http://alliance-ltd.com/userfiles/porilorebon.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607132015f06c---zazikubadizasu.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd83186e03---pobose.pdf
    • https://trimix.bg/UserFiles/File/30670355793.pdf
    • http://alliance-ic.ru/uploads/file/50500611962.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0421c42090---57562633620.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b5426028c---97870790318.pdf
    • http://wildpflanzen-planung.de/file/rabelemadimosovevemolaf.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55781099941.pdf
    • https://deniz-sogutma.org/img/userfiles/file/ditejitumezokisalosigej.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/89756711754.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=four+taloned+jackson+fork
    • 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_off0001190d.bin
b35205b5cbb764fcfb658fcfbf4da9f0920637305782ba5cd452cc92f6f85217
pdf-font-stream PDF embedded font (sfnt) at offset 0x1190D 17232 bytes
font_01_sfnt_off000145d1.bin
ba1f518807c3db22992d2d64b4b227e39ca40a7da53b865e65ca32eb8af582ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x145D1 10676 bytes
font_02_sfnt_off00015e74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E74 16792 bytes