Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0086c3d215b511…

MALICIOUS

PDF

81.0 KB Created: 2021-08-19 05:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 596fff407d6ce8f8c024a5d5460dc542 SHA-1: 9547c19146e9bf8283ca1970b916cfc56a279456 SHA-256: 7b0086c3d215b511a8e220f6b09b35aae69a0db921c55126e157191e10a2316c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9502

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://maroba-zirndorf.de/file/zudakusevosibu.pdf In PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/lepibegufesuzemofomofe.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c51c5fdfe---61994090718.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e06396544---35206652853.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d0af25448---67429622586.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c277f0d25---20938031396.pdfIn PDF document text
    • http://boldogelet.hu/media/nomuxubi.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/kujumovexabiwadavobipej.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945c12bd1bc---wewuvuja.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/92694184463.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/45995432685.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93229e79c7---zasotipexemujeronupitito.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/40042081716.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa97d10f0---61063825229.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/rakujadifedefami.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/zutojator.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa811d66cef---30658890077.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/guvogenogiwonegi.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/682d1af02970b6c8617cece579ee0b1d/nujumitomep.pdfIn PDF document text
    • https://olterus.org/contents//files/dodonogafel.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/55012370236.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/63388055287.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1f2db88b---69664013532.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/10027579871.pdfIn PDF document text
    • https://bem-sa.com/img/file/62301320214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=is+apex+legends+good+on+pcPDF link annotation
    • 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_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 10452 bytes
SHA-256: 129cde0604b476d22d5ee7da9717ada9bbfe81f2631e819b99085507f95b570e
font_01_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 18024 bytes
SHA-256: 27176ce751a9ddc67258d9ee16d8fc9d0a7f5962148e98bca59631056f9de8df
font_02_sfnt_off000126fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1