Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea62e02b8f0fcc9…

MALICIOUS

PDF

88.7 KB Created: 2021-08-03 14:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: acd657cc2de92e16399ce1b42de21f5f SHA-1: 59c43aac0d3fc09a03610daf1c4d563b6b2aad0f SHA-256: 3ea62e02b8f0fcc9fbe17bcddbcd6e33a7ecbe71c1d8df5295102ce2d5fb45e4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm on disposable hosting further supports this phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/b7vdjo1knlno838anrnkl1rnf2/lutapapejibemujob.pdf In PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/1e66e83dc871215b48902b794d2bca25/36079284362.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0918446001624221156.pdfIn PDF document text
    • http://unseretochter.ch/images/file/38465752551.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/vabijikokuleb.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3ed417ba---vefurogasejuratin.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a43a8f997---59239506270.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/i05v17gh4sf0m6r72f16ugr1mq/80336127459.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108d7b27938c---xotakivi.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/pinejagutuwedi.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/nivotuluxum.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/53813813192.pdfIn PDF document text
    • https://amblamy.ee/upload/file/72030679176.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfeac18383c---33594229834.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b811529a26e---xozomimosexis.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/1804075972.pdfIn PDF document text
    • http://fittbike.hu/files/file/wozibofuteva.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/pezoxiwulovopikaw.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e052eda4bd---xenebitetatazuvodexite.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/kiwejovitisog.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/4470800132.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/25c8ce0b565814e507b9bfaaad89f662/83801378979.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966ffec4191---pikubofavosodux.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/6u9iu37qfcuq2omar01unfnaof/78156979622.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210626_19C5F973DFD27F1E.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/22292626825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=distribucion+de+frecuencias+continuas+ejemplosPDF 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_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 19016 bytes
SHA-256: 89d96fce1c3ba5662d09bbcef470a13b7b5e99b27499c14719a3ca4e2ef42a5c
font_01_sfnt_off00012193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AA 11152 bytes
SHA-256: 7f8043e23f18442a001cf1a7beb09e78e0cd624c81b69057e0a2445e1d9668df

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