Malicious PDF — malware analysis report

Static analysis result for SHA-256 7904213e08a9e29b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 01:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2118f84f7b3543ba5f78c245e6e89f7 SHA-1: 6e68701cb47836eb59423fcca14a22619eff3e7b SHA-256: 7904213e08a9e29b92ae143677a042dafbbd3011998f98b34e949480794f9a3e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains or potentially compromised WordPress sites, indicating a link farm or distribution mechanism. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://odumakus.com/uploads/files/rodafadage.pdf In PDF document text
    • http://fzcce.com/aimgs/uload/files/8801474549.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e24b2379dc---72060453059.pdfIn PDF document text
    • http://mousike.it/img_ins/files/6538017590.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/varobuvizomuxu.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/tifenixuzijuza.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/pexonunedevaboxo.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210908202958.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/19020723128.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/gozaxasapinarur.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/39760475263.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e43dc72e2---babokidaduwi.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/jiwujamiminapenedazox.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/38048828902.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/kesijusorumikisabarip.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/52924589319.pdfIn PDF document text
    • http://gro-felix.si/uploads/ruwubositizoluzud.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021972249411000.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210903015423.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/56317438546.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/gurizabakik.pdfIn PDF document text
    • http://p-energo.ru/content/file/mubegox.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/juzisinesiduxor.pdfIn PDF document text
    • http://grimastone.ru/files/75899377493.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/hhju5culq73jjpcp5i1kktspkd/boven.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/840829880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lic+all+in+one+calculator+apk+free+downloadPDF 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_off0000e073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 17808 bytes
SHA-256: fa7906d068e85858c0ac2a3d027c8bed893ab56d8ae66c41dc555f683c7a87b8
font_01_sfnt_off00010ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D3 10680 bytes
SHA-256: 38bf41ccbfa4c8c06b9a9f8336e52fd1ac5f638414cb32114e1bac2f5207f165

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