Malicious PDF — malware analysis report

Static analysis result for SHA-256 7295c7234d4b0f46…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 14:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f2297320c781d85d9a5d9f3fa9d7d95 SHA-1: b525ddcb1449bc1b3597bc4e708893e3e2a45302 SHA-256: 7295c7234d4b0f46c38fa1ea0bec6d086cfd3208e4e125473e7de45da069dbdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The presence of 'utm_term' parameters suggests a phishing or spam campaign aimed at directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=apk+editor+pro+latest PDF link annotation
    • http://bippex.com/filespath/files/20210902060441.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/vasunujexipibenatodopiko.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1614294a32a472---71907573241.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/43927562811.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/6461203983.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/pofexiwefanutunokuvureka.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efcb2576c4---28765590179.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/23224474588.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/dipidoxo.pdfIn PDF document text
    • http://sdes.in/uploads/kuvajekesigemakidijizar.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4c7qd2p4h9s0gei05p4q1psq40/95133489903.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfea858727---fazobusiluvu.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/34465841058.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/90880990593.pdfIn PDF document text
    • http://egitara.com/upfiles/files/89450132835.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138817cead1c---solizakelaxijawufotixigo.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/jujobijinotenawowirad.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/sijaru.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/05a2daf7f4b61b4db9d4de0ae36b47d4/61103064661.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db97501865---73951217579.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139f923ce115---rigudetalumefi.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/13414891902.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_off0000cc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC45 18600 bytes
SHA-256: 5dc99fdc59b15ef7e221343229eef41c55ab805736d180ef869ddd2c22426d25
font_01_sfnt_off0000fd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 10356 bytes
SHA-256: 91a78251cea1b53756247ff4f7f847fffae77d6d831952dec3f091e72224fe0c

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