Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab02f81992d6208…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 12:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 10c6a27e087530d10fa591789dcb0235 SHA-1: 120f46d286776c76856ca5be75fadfe2f852663a SHA-256: 3ab02f81992d62084419010de3a4d7784cd9b9f90cf5977747958aa2977c6367
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains. While no scripts were directly extracted, the nature of the link farm suggests an intent to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9062fbfaaf8067338f0c4bf27293e6a2/nonitejiwodojefo.pdf In PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/1iooik02jsjn6bt5j88g89ul23/papave.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/071744052787.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/dedajagafexuxotebed.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/44206436439.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/7420133545.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/rugiseve.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8bbc57116761f7cc750169712b8d86f7/xedunapub.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d107b740---koxinonuxepudasezo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160757d0b7a9df---42754092777.pdfIn PDF document text
    • http://novena99.com/uploads/files/202108191709218942.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/p1mig2l9vpbi3dbkim1j9m3shb/50676226517.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/zaponerovasozilupipalixix.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/63894246035.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160722db018369---pawepevukobovigamowumupik.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42650482e2e57c94dc8ff9df85672f26/fawofudolinajurit.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/oluccucq9hmmjj9o406bdjq1ur/liliwanurafudijewaxaros.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/vifewa.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/87295912283.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1348255c1---85861425734.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161234b59d77d9---watiwuwukutezunud.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bce7b83ed---7960827832.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/nukatinej.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f06f8176c18---xiwewoxal.pdfIn PDF document text
    • https://qqhanoman.com/contents/files/vafewedunepese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=swiss+cottage+leisure+centrePDF 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_off0000c789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC789 16216 bytes
SHA-256: fc1a5325ba49ff146f4634c565322f437cfad5bbc782b2e56a72ab61d9c3cdb4
font_01_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 10668 bytes
SHA-256: ac5e731e9e23ad77911d2c48cbe5f9b35d68b9323d844f5e1a4f783d68fe19c5
font_02_sfnt_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1