Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d2c9e286004f1d…

MALICIOUS

PDF

67.7 KB Created: 2021-09-03 10:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 278cad903207c49a7d45745c68af258f SHA-1: 109557341cdc6590e11e5c76cac1f11c2880ec68 SHA-256: 58d2c9e286004f1d9003cd21b5775eac0d80182e5bc3ab464b964d33fde2a6b5
176 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document with an action trigger, designed to look like a legitimate file but containing clickable links to external domains. These links are hosted on compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751d930a1cf---sexepanosusoragorixijumu.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c858f2e5b6c---1341372781.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e863822bb2---97579509013.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9bd7704c6c41cdf4aedb91937704d815/vobinile.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/mivuribu.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/zimexizogebinegisisaj.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a2a62ed73---duvawobubo.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/98924012102.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161162eaf35c27---47902242463.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/92235285929.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/35395831349.pdfIn PDF document text
    • http://vo23.ru/upload/file/sogufosojuvu.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/xabasogu.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/wexeviparedexidizenamu.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/2873318018.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/80268588052.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/jetadutulugonapabenidomus.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/zinokojizuvewibadabaz.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8fb1afa7---lofugiwadulirasexatarogur.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/5hs9o65a55snrcdokami8qh890/repenuf.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf455759d52---zaziwewefejofize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=patanjali+yoga+book+in+english+pdfPDF 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_off0000ad9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9C 11156 bytes
SHA-256: 31ca171410e78becf4e0f844585bfd6217a03262a8ad91f03e07900b0fa1ad89
font_01_sfnt_off0000c738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC738 14044 bytes
SHA-256: 350b1d51ee9164b0f837a98f5fa0fafeaccbb119e57f89621ccdf125e0ef49e2
font_02_sfnt_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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