Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe8fc03f1323e50…

MALICIOUS

PDF

92.2 KB Created: 2021-08-18 13:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff91ce825461cbd104f2acadf03db564 SHA-1: 3b6ab1ca9239d454a183bf5a2de8634819702e71 SHA-256: 7fe8fc03f1323e50d4f13bba1feda89bc95fd153ec36aab267d6c514d056562a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL distribution align with techniques used for initial access via phishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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 https://tese.in/ckfinder/userfiles/files/venirovoruzowejotorid.pdf In PDF document text
    • https://haidangpc.com/contents/files/kugaxolotivikeg.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/29007556249.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/63733432844.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/simamar.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/83150645548.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/29169499197.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3cc60450---95225789832.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073519fc92e7---51989427409.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926120d439d---78164665900.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b56f3ae62c2---34949297549.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/luzep.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ef124932783a04b3844b7b94ee22ca14/97111815741.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e779de895a---basewisenexowubufowe.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/12298624339.pdfIn PDF document text
    • http://sushibelovo.ru/files/3639724077.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/55803461843.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/bararitejegiponusozulada.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/am7rh4o9atuf3umrmkbqt02rm2/96304710650.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/0ihm5boqo61af7k1earuuhbe70/77367831405.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/20331070052.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/jaxalojusodifobotip.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/23473576661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=blank+100+multiplication+chartPDF 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_006_off00010572.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10572 17416 bytes
SHA-256: bd2d3db9e47f83095d91987430263a113e05390629f19b0306f119706142d1cf
font_00_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 10760 bytes
SHA-256: e305603acae642cea88e0181e9ccff111a6bd3cf9915c73ef720e610efb1474a
font_02_sfnt_off00011fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 16336 bytes
SHA-256: b518e7c557b19b38e3daf14b5e27c854378dd81a39dd5693ccee6297347b3fc5
font_03_sfnt_off000149e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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