Malicious PDF — malware analysis report

Static analysis result for SHA-256 709f034321f2a2e7…

MALICIOUS

PDF

74.2 KB Created: 2021-09-09 11:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf41526bedd1e72b21bc090b0ba4a0b4 SHA-1: 2f5b19c1f0ecd1b17ee728569e2a770ba8666d8d SHA-256: 709f034321f2a2e71e3d23361c8f31dee5fae50651ca2c3032538486fdbe35a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, including one hosted on what appears to be compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=adjectives+that+start+with+i+that+describe+a+person PDF link annotation
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/196a5f5bae346e68ad12f1c6cc2e5960/pidawapapav.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3db287462914cfbb245a50b37d1f8f50/7726180876.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/45405296603.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/39674906593.pdfIn PDF document text
    • http://lovesenergy.com/file/xoxebulep.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/lokedoxi.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15244774895.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/39676653996.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/23148275735.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/gisopiterawitorovajasi.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/fapokufasi.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/nokifix.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/ziruzavim.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/88424298551.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/zesasu.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210908192901_5nvmto.pdfIn PDF document text
    • http://servicepapik.ro/files/59813099374.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132635d7029c---7400299625.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/53354497634.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d7e9a0a26---26952484499.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/tubetofibulekis.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161365a55f3be5---8833377346.pdfIn PDF document text
    • 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_off0000c0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C7 16156 bytes
SHA-256: dccca6597a0b1b2815c23a18342a12db7e42ff49450f645a3bb89740dd716cdc
font_01_sfnt_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 10968 bytes
SHA-256: 65e582f5add776e3277528865d6a6567001700c4274bcc1ccb386698067e327e
font_02_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1