Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1f3dfc8c924579…

MALICIOUS

PDF

88.7 KB Created: 2021-07-01 15:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5dd7e7e7c2011e3363b780c5268194be SHA-1: d8cc16070d81ccdcdffa5168af7d45dcd66084d0 SHA-256: da1f3dfc8c924579e22e96dbc6cef1939bee0a0d9fc81ce094a0b02922de9a6e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly indicates a malicious intent to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5ad7b11eb---64376158832.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/zalomoxijuro.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ae86485fe62---53344562881.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/786619029.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/fawadewo.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/futif.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/bokofekavoxofopuvegup.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/add4ef8cc58ec556d293253f6b5be03e/15404357211.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/jusavozidiberufukute.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d8375f52b---22665368278.pdfIn PDF document text
    • http://jarosi.hu/files/file/24473153529.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/980c36eb248a01e192fdd2d841b68fa8/fawedivadopepenosawinu.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609e49230cb96---pujiwimatugawarenurovijit.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160721af11be2f---80048284092.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/gawapadekopovimubof.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/76879317849.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/3d128c94b8ec15505de73d54db6be66c/firafimolukoluroba.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff9a3bdc8---88445239737.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/73685731642.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/25299d371b5cb9c979edee6f08a77ed6/92008964870.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/kifane.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160945f8281cbd---kufogonilerafosipupadug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gucci+flip+flops+by+bad+babyPDF 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_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 10572 bytes
SHA-256: eb773f7085bfcb5313bf5d85bb34cc85f650e77fc259c3e9194c7950a3979010
font_01_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 17424 bytes
SHA-256: 4606b9a80d7134377e46b9c0f1691ead6fe25b02080ae70f38fffedf0dc7658c
font_02_sfnt_off00013c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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