Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6863c57eb5b967…

MALICIOUS

PDF

94.9 KB Created: 2021-07-31 19:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a08d55d08afee763e266adbe0ca862b7 SHA-1: 08744b748ba1f6cd3e0724b2bd3bebb9c7f68abc SHA-256: ed6863c57eb5b9675e732335d0909168dea7fc0fe44ce0aa98f4a395ff352836
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, indicating a link farm designed to host malicious content. The presence of a 'download button' heuristic further suggests a lure to download a payload. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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://gamepinleri.com/calisma2/files/uploads/gifixesatev.pdf In PDF document text
    • https://autonoleggioassereto.com/file/budekemobebivuwotojefufil.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/92698657259.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/menavumitenanuxo.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/fe80b7814ca2dd550d1f5e278a666e98/xawodimimaboso.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095ccbf6c77b---desejoloxemu.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16084ee9ddbdf9---46495970393.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210723083644_wi84fl.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/mivowujozidivezokagorebe.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/8629879562.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/wujuralonenelu.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2ff8e8a5---88467992150.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a0d09e10---81256981883.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/segosa.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/vedidiwikedajiwezajudi.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/samuraxabedezopidi.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/37639587637.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/tevabadig.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/50903135475.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/86b7c1440f551f26c245ee0a5bc0dc57/52461674156.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da68f28424---lebudinunodagosenexujubi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161007a9b9aeef---77765677329.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/30ccafc748e4f7cbfdb16219c5bc66c2/98360408932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mini+militia+unlimitedPDF 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_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 17708 bytes
SHA-256: 80277183398837817937f4780671df0b2c073e06354ea833637c4957415945ea
font_01_sfnt_off00013f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15759 10116 bytes
SHA-256: 430d1114c257e0352c6f76dcbbce89ded337c627e7af9d1e4e463ea04cee67c1

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