Malicious PDF — malware analysis report

Static analysis result for SHA-256 0622f4c6352c5d49…

MALICIOUS

PDF

73.3 KB Created: 2021-06-25 02:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 46bfb09f51a69774e7ab3cda2405721b SHA-1: 86c3cad6db8a8d33887f45979c398ae672bdf23d SHA-256: 0622f4c6352c5d4931dc46d075f0f8036f19cf5eced8b04e9d4fe0e05734e3f1
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 0.9998

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee4dab88ba---kesuzijodabijatadiganubaw.pdf In PDF document text
    • http://asea-admin.com/_userfiles/file/20210503050008.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/piwuvimatu.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/dcf54479d15b5a6ae33c661f9cb08fd9/23296141203.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/jezolumubate.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/93369788716.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4985f0568---sonejoxanuzekitemu.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/68116064568.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/ripemadezupuzuwis.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/61423736463.pdfIn PDF document text
    • http://abwessex.com/uploads/files/dibotapurupag.pdfIn PDF document text
    • https://777mto.org/contents//files/diboxukujiwopejumi.pdfIn PDF document text
    • http://allasclub.com/campannas/file/jipawinenir.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/linomorozozezijexema.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f9cbf0c9---99000187820.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16091c019e57fb---fizebitefe.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/76734126069.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=vidmate+apk+download+old+versionPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 5288 bytes
SHA-256: a6163266c66791221788397c754e5603f3abdf6f779f102e22b067ad4917233a
font_01_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 11280 bytes
SHA-256: d7897372fbbb3be19560062564c122a6c1896013634708e496b64c83698e42f4