Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7b9715aa317026…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 16:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1631f030a980e73e805818a1904c8099 SHA-1: 5cd518f81c4d17ba33f9ab3ad372041f6cadbfd1 SHA-256: 4c7b9715aa317026a5581affe5effbd8e8ffc3c7042849c589b32e4d27ee6fa1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The file also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute phishing lures or malware. The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent, likely to trick users into downloading further payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=compliance+manager+job+description+pdf PDF link annotation
    • http://vintageguitar.ru/ckfinder/userfiles/files/86685560575.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/wojifeni.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/71638043946.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f93bc26fc---tetisudimosepasuxa.pdfIn PDF document text
    • http://penney1970.com/clients/7/74/747debde904cce1d9d58e62e9103e361/File/89855213467.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rguh66kg6m6ve4i3n7mmj46sll/17936344277.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210828163629.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210710190654.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/o8jpnujicno44niq6ibnkm5c6a/musorulutuwapugad.pdfIn PDF document text
    • http://elitvorota.ru/f/file/56232338932.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e138962b24---kefakeb.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/28fc3c736ca8305da4fc1a5191e02b94/64807599508.pdfIn PDF document text
    • http://islandpointfl.com/userimages/21492184963.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ccee58383---12645958616.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/76874031025.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/84690061075.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/xebuvanuzumujasemevi.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/sudonagaxisubu.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/zigelotugo.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/rodarirekemaratabe.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/butiresisixupanusinesexam.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/32121459576.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/13412564430.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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 16076 bytes
SHA-256: 5eca337a165691485117e3d7275f398e93a9ebd500fc850479a98d4a98b20fdf
font_01_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 11264 bytes
SHA-256: 57b25250f3c889c93f6e03aca1ddab7561b6f1e398609bcdbd3aa2f2f6bf34b2
font_02_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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