Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d51408630f0ef3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 18:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 837a8595b2a72b468e710deb14b0979f SHA-1: 4fc065288df653e4bb3a2aaf090c09dea19f116e SHA-256: 74d51408630f0ef32cecac36db3470c108dc511c0cd41e84c8c23557531a823c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306b9f4573e---zizagulitawi.pdf In PDF document text
    • https://remini.hu/userfiles/file/rutox.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dovanefajuv.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/mumoranaxudanixudutogofa.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/buxid.pdfIn PDF document text
    • http://signauction.net/userfiles/file/lagutomokabiluvefako.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/lelijezovivapasibub.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/lozowunisokasema.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b7nn4o6d37re9q8k4pqreqgfp/88492943496.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/putup.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/41607374237.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/sazusit.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48792586561.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/pumiguluxuxebakapol.pdfIn PDF document text
    • http://serviceelectric.ca/userfiles/file/33402265631.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/supemotur.pdfIn PDF document text
    • http://compsult.net/userfiles/file/xegikanamixipi.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/jedozuxijogaluberowu.pdfIn PDF document text
    • https://architektor.ru/uploads/file/refofi.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/95884924494.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109050903319995.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/6d8e6db298d87a8fd00b52a179052844/zeluresaz.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/58178663771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=critical+ops+aimbotPDF 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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 10472 bytes
SHA-256: d27cb75b81c3d53bb1b7fa07c3426d5ab90d60e69b3c00beb6c0d37c4f43ae85
font_01_sfnt_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 16984 bytes
SHA-256: 475dad129789833cef4ef2ebd86ab54781231a8042e5ee51fd4d62f7474df629
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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