Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf85dca8cdcc4e67…

MALICIOUS

PDF

105.1 KB Created: 2021-08-01 12:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b4b52ba60a79c474dfcc64711106592f SHA-1: 4defc8810a21df528cbf002ba9348d19b195b620 SHA-256: bf85dca8cdcc4e67d15587ac32060501859720224465545486e47cf6932b3413
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9673

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.
  • 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://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0459d646db---navokanotejodaxu.pdf In PDF document text
    • http://go-pxl.com/uploads/files/bufoxajod.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aad3bfe505a---26884457645.pdfIn PDF document text
    • https://stopserv.ru/files/file/45012899321.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/tagapobawopatexadi.pdfIn PDF document text
    • https://ikima.fr/uploads/file/22992328026.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/g48o9cnle0tv809klg1bl8ccnf/83764079945.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/82041382819.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/03c98fb0092edc6b7249f87277b848c0/67240820711.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/73901373735.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a559dc9e582---xinisilu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5ccd22ab---tovamibolizufuf.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/47451272137.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/18576727237.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ca63b4f6fae07156a3d2f78b87589ef8/tokonopijadimodopu.pdfIn PDF document text
    • http://gardatrans.com/content/Files/fumosuwigusabijakak.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32005514392.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dceab325d---gudoboda.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088db53c3e93---gazabevakefomutugo.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/41a5bce2b5a33fef9c64164a9ee13552/18866769899.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/42444609946.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/21385230190.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/nibiputewopade.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/tuwamexomugavovumofebaki.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/2877043644.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54d12a8315---52971854303.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/xonirudipomasanip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=interstellar+main+theme+sheet+musicPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001537a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1537A 22772 bytes
SHA-256: 40543cfed67f3efe9c7b078c0372e824f4eb9e9265d0605a949af6d210e1eb4a
font_00_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 18180 bytes
SHA-256: 2d054f5fd0192c3f483d5352a9ef690138be30cf0ea13b0f0f22f5281d3685fa
font_01_sfnt_off00013c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C16 10424 bytes
SHA-256: a8ae3040750156d54ae216a6d78b57ac0bc1a17b8228644dd54e3765dbad8116
font_03_sfnt_off00017b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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