Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65e86115e6719f8…

MALICIOUS

PDF

87.2 KB Created: 2021-08-28 11:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d305b5852423c58959c0f4049f3303c7 SHA-1: f657b5ad7552c2c4d25dc3805a5145ef5fd98e9d SHA-256: d65e86115e6719f8c0ac47fdeb4ce52428a74435325948792b47611c321ee40a
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of urgency language further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://esoftland.com/userfiles/file/zunaxokavitobijuxojo.pdf In PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/2b70fe285088fd3244ca5a1313fbae71/furajo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8437d8cee---93998439352.pdfIn PDF document text
    • https://jobtiara.com/files/files/vabunowexogaxunutezo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607233db894c5---43438137700.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/76566902273.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/vavusisuxogawodu.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210628_8E0AEC9149C016A9.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/66554742456.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/bc3244c26b9d3b1257da185f32247447/40413579900.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bbfc3ddc5---71134363175.pdfIn PDF document text
    • https://securitydm.com/slicice/file/58303008443.pdfIn PDF document text
    • http://gabortech.com/admin/file/37258667586.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53c287c9d---35989312785.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2e523d000---losuxuwuraburugopinexumav.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/79783595080.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/miwakizudobaxafexim.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/sujojuvekev.pdfIn PDF document text
    • https://membermimpi.com/contents/files/pekixanewegar.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/sajipozafajoji.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/57498120356.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/xemasekezilogomobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=thermochemistry+questions+and+answers+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_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 18136 bytes
SHA-256: f458a432480d6b8325d2397c7800d532a9524e71da4b07d9eda63c7a48db64ea
font_01_sfnt_off00011c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 11248 bytes
SHA-256: a75109fce7af81d78e989d4edf1f120ce0b370ff52aa1bed219a92bdbc614650
font_02_sfnt_off000136ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1