Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a51f6ad9248c7f…

MALICIOUS

PDF

91.1 KB Created: 2021-08-03 15:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6517f8cb45a49ff97278043aa873d4b5 SHA-1: 176a2b464a6042e8c242f50fc9f984c258ecfcdc SHA-256: 43a51f6ad9248c7f0614dad9e4761a962448feaf9fc5dcc4196f6e69d3efe3a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of embedded URLs and the overall structure indicate an attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://perles-del-beya.com/userfiles/file/53636241953.pdf In PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888b8c9b1ed---5384082593.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/tsnsd1edrkiacvpqtc3kvppghg/23553136660.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/viledobu.pdfIn PDF document text
    • https://icbacademy.com/upload/files/waxugakudifirositolis.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607017146893b---86541195744.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/mt592hrvgo1s79chtb6begro6r/55837833343.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/mofurevuragigoxepodowobi.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/gv7uqjsark325nbdfla4o5sl7n/88582048507.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/sjafug81j2449o1o0l07aafi1m/1240117639.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b678549f5---33351210190.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dce0ade8fd5---kabapodovewugewapo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc29189d43b---zujomosebekufiwajebubove.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/jitikagugumazubu.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/vovupeki.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/fowaluxile.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608784509104c---18713531561.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae0ca5af22---57803699060.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/busotoguzavubogil.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/be9df027857f22679f4994063fa16fdf/vezomutonesoto.pdfIn PDF document text
    • http://cycling-software.com/files/file/pavexigeg.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609910051dc68---76610769178.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/deparananizevatozus.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/r3vmapr5eioiefgup2vt9mqobi/pixokuta.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106270720385829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=miraculous+ladybug+season+4+release+date+in+usPDF 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_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 17416 bytes
SHA-256: 18bf1e712aa9fa576d394250518ec0d0d1628b625d0ba4b5ef99d3ba572c3a1f
font_01_sfnt_off00012b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7E 10968 bytes
SHA-256: 0210c7f71a55ed24bd73c814cacbd8ac5966c771cf45b3f4db547d59b4045e16
font_02_sfnt_off000144fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1