Malicious PDF — malware analysis report

Static analysis result for SHA-256 03aef4f0cd90e50e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 19:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ab8ee22b58ce35e133f8ca9ac5e28ac SHA-1: 6966ca6cbc8b78b3311515724edc7bdddb3147cb SHA-256: 03aef4f0cd90e50e9473e33a9ae93199e831fa240a5c12ab7ff4fac70a257e9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for further PDF documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically flags links hosted on compromised CMS upload directories. ClamAV detection and ML classification strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/6a4a2c164dd93d2ede1b36de039fcada/17589750712.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/52ti400q46mopol855baepjt7q/94819335667.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/3056764224.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/74bf8fe7a21de37bc00f2f38b1bf9b00/20693160611.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/74110740640.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/kozifa.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/tedoferibarazafovagoje.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/powopewafe.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/silarotewubidawevejupojam.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/kixofudasozibafavukoduro.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/kakivolefakabiri.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a3ce997185b---jotavarabolijajebilixaz.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be044a7434---60742444014.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094a92b012f5---sidew.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079984152f2d---85306987955.pdfIn PDF document text
    • http://unseretochter.ch/images/file/49958185644.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kusupigapos.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ji75s8d2lnij3f2ic4lum5ka0a/jilikogulovukuda.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1381f869c7---xupar.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/40770127627.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ks467ugeg8fn6m45frsva2vnq2/noxuk.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090d91e291e4---99334595951.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/jesawusemipazavuxirolago.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/xagujaganorokefew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=los+arboles+mueren+de+pie+pdf+completoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 10976 bytes
SHA-256: 93feab6e0774041ba05eaa7f7052d5a68d9e4761dfcfd08c5c3cf6b1667ee968
font_01_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 19384 bytes
SHA-256: bb1eb98574dd6277f688a8e7bf7aa36f1dcc2407184f2800b02cea0abb7df35e
font_02_sfnt_off00012c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1