Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2e40bbbbad94ba…

MALICIOUS

PDF

126.1 KB Created: 2021-07-28 07:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6eade11d916f4c9c6d41374cccc58094 SHA-1: a3622045283e1569c4261d8a6e87f625da511765 SHA-256: 0f2e40bbbbad94baac9af8e76d6ea81655c412dd22c9770effa34051a8f97272
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://alvirne88.com/clients/71477/File/jajijuxanajataxipidoje.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57b297ead---mizofazibat.pdfIn PDF document text
    • http://bronia.org/userfiles/file/tamubesego.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/wedudujokataporedugeriw.pdfIn PDF document text
    • http://adice-area.com/pictures/files/seban.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/59402070830.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/gifabogu.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/43946183853.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/pidalaligovaduz.pdfIn PDF document text
    • https://kristinanamaste.eu/files/59552075194.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9eea226687---polekumo.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/nukutopolax.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/89594843528.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a7ef754d2e4941319a78c15f8f103278/95349921449.pdfIn PDF document text
    • http://yepuco.com/uploads/files/32822567785.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d83e81e73c9---36778344166.pdfIn PDF document text
    • https://majubesar.net/contents//files/sukuzipene.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb605770e---ranoriwudetagujol.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/kubizo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0f1d3efd---bagibubapilasuzo.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/bafujinawetirunuxokidev.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0c83d898---5766015843.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/cf64646111fabfa0933ad84413581f3a/zusivujogibukepagapote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=philips+respironics+dreamstation+go+cpapPDF 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_off000187c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187C5 10964 bytes
SHA-256: 4d678ba5c11f97f89d9a35e6586d15c5c156d8619c056a912b84d70e67423749
font_01_sfnt_off0001a0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0C2 17672 bytes
SHA-256: 8480a2b7eb973f28c89f2b8739bc9f804772440c9f67352a8b1be57e51e0a044
font_02_sfnt_off0001cfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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