Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62f08403d4cbac9…

MALICIOUS

PDF

74.2 KB Created: 2021-09-06 08:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d814959334424efb8e93220118058a00 SHA-1: 5c546d6e20b60c360ab3f9031f104267ee8c8918 SHA-256: e62f08403d4cbac930a13d3026e62e1eb51774241156f78c9e4325cb3fc8efcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a47225bda13---49243541069.pdf In PDF document text
    • http://barrospizzadb.com/uploads/files/93445171810.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles//files/99551474686.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/fejivudunagezofalebijolam.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/44746444754.pdfIn PDF document text
    • https://led7.ru/file/8395610427.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f93b8a696---lufusavaw.pdfIn PDF document text
    • http://temple.mo/userfiles/file/gemoxupovuwufasil.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/65542956168.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/29403032746.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/jujozorelewironotul.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/32282318373.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/97080095724.pdfIn PDF document text
    • http://atomleasing.ru/media/File/sabiniwawitubametupenipu.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/vuzitujuximepef.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1fddb33a0a8701a7a02647fa12568ab8/46314615424.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/rasutonid.pdfIn PDF document text
    • https://sapporopools.com/contents//files/81010956353.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/n986t9lhthafi323a748fi4470/32314617076.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a80ecc4ca6b9aa9f0562378010f2f704/vaxudexunudezum.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161321b0a7f4b6---61226833904.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/15284723847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cardiotonic+glycosides+pdfPDF 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_off0000bc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC94 10940 bytes
SHA-256: e30f9b97f61bced2a8316feb3777f1e76797c82cfda3920f1eca72170ce043bf
font_01_sfnt_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 17512 bytes
SHA-256: 0674e05fc57459cbf8bed7640f60201114977e0edbffe75e2f8920dcec166781
font_02_sfnt_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1