Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b69840de75285d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 11:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 182e9064f3098bccef0ba7813155d307 SHA-1: f042cba3ca5ce400f01954a56dd6648a2c409eb7 SHA-256: f6b69840de75285df28625f11b956d4f53bdcb2f32e7d6d44cba523ff3b2ca41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised websites or disposable hosting. The presence of JavaScript and the link farm suggest an attempt to redirect the user to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=gta+vice+city+android+app PDF link annotation
    • http://skkl.cn/filespath/files/20210912124629.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/tagajafukikuvotiripin.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/15679814417.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/98284748138.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e1fa57f4b2d6c2e744fd003a9768e6f6/nuvepizotidilibi.pdfIn PDF document text
    • http://ruihuitax.com/files/file/70764151259.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/17615898064.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/dotonotekaja.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/15875741993.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/82428133306.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/33773004721.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/bosiso.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/ledixugova.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/73066237701.pdfIn PDF document text
    • http://apsons.eu/files/file/89343124572.pdfIn PDF document text
    • http://osayit.com/images/file/rixavefebezuzirikisiba.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419123a782d---80462041757.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/motadatirexuxekebamorusut.pdfIn PDF document text
    • http://fittbikese.hu/files/file/67487094656.pdfIn PDF document text
    • http://irinabailey.com/upload/files/fuwefovokojitusepamuv.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/25607727545.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/38336619707.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134378320b8e---83033936559.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/11338610494.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210905094250.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_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 10512 bytes
SHA-256: 392489aceaa29d2440416a0a8d98adc79576e617ec043ea11403a4baf70590a2
font_02_sfnt_off00011cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 17420 bytes
SHA-256: 3366173ebf447e7f9011754d6cf0be6741a0bf1b2897c4a1bea24a16856dd88b

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