Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd77d469f1da8c1…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 13:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3a8e4d7e0ac36a1705c8836db485a44 SHA-1: 56d1165247eaaf7e1113293d82dc0b847b769085 SHA-256: edd77d469f1da8c1155705ecbbf35e0f825f6b6ecca35d6f4e7267c6a4f8cf68
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable domains or compromised CMS upload storage, characteristic of a link farm used to obscure malicious destinations. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of a link farm suggests an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://ph-easycome.com/userfiles/file/20523756729.pdf In PDF document text
    • http://lamachine.nl/userfiles/file/kafovanepobir.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/pukine.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/wukezorutupuguvisinud.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/woxobitel.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/kuvobegenumapaj.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/josefaporikusasuvoviw.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fcf8da71cc3f511a9ae4fc63d8542f1/49324512908.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411c32b6fb0---20007660033.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/47404755367.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/dd8c9a8820aa605de98982b534e80a8c/9669954099.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/dufuvopivu.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/wukomalonaxavasisebuba.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/sozewununironoxeguno.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/gabuxavagesapafufid.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210905_E53672A6FE37DACD.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/vitoba.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/13637618981.pdfIn PDF document text
    • https://penzion-palice.cz/content/24344867072.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/jevubukevulobisuto.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/84826254852.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/51718786515.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/nibutet.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/46738514505.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/83873743095.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/7968534979.pdfIn PDF document text
    • http://lagrupacio.cat/file/jeteragobesuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pk+online+moviePDF 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_off0000c54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54D 17272 bytes
SHA-256: a9fce47759a5548dbe5a26c6ab21cc6891fe7f13d19da43a72f653ff63858b5e
font_01_sfnt_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 9900 bytes
SHA-256: e134e60042630793b425a57ff8d04f74fc43dcc3f48b9707b5e9e8f5e1ffc76f

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