Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4c8b9481d02398…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 17:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e98fa18ffcb9e09a4014f2baf007a7a2 SHA-1: a6101064f089d9e6e8e37a06b3468dc50ea95763 SHA-256: cf4c8b9481d02398984aba621db38c32108ba98a145e2d9565b122b07a237695
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malware. The presence of a FIFA 20 APK download lure suggests a phishing or social engineering attempt. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://vladekoservis.ru/files/88889215595.pdf In PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/pududowavizijow.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/porejuxugiwajinebe.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210913055829370033362r46.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/82139076911.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/gibevopajevogurag.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/fakaxovesejewumedeweneviz.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/5554222759.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c250cca7e2---panowufotutanekixomo.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/boxisobadubetukon.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/32631798443.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613999459da02---xoniledaragogusuwove.pdfIn PDF document text
    • http://mamitobe.ru/files/file/bokunimofotewi.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/34975482123.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/83195978980.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/bonilinaveresobivovopiw.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/55239626766.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/xotukufekutevifi.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcd52d793d---dulip.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/66844023235.pdfIn PDF document text
    • http://hangquangauto.com/files/dejupovuxapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+fifa+20+apk+obb+dataPDF 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_off0000b1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A4 17108 bytes
SHA-256: 6012470c29f49481aa994778fca24083ce6e9f6c92999d220b009624b8f6edc3
font_01_sfnt_off0000dd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 10652 bytes
SHA-256: 9b4542ece98c9af69f229400f9057729984fbda0fb0890403e09b52d1283ea0b
font_02_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1