Malicious PDF — malware analysis report

Static analysis result for SHA-256 b682a29cabb61a66…

MALICIOUS

PDF

126.5 KB Created: 2021-08-01 05:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9e24c0d5519b2a4321353c82a00118e4 SHA-1: 9a151ab034cd5726689e1cc299fe2600b7b6582d SHA-256: b682a29cabb61a666cd9df70cd56767bfd029d944d690be153569391e3167902
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. 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 0.9991

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ketchas.ru/uplcv?utm_term=customer+aging+report+in+sap+b1 PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c68a32937bc---67869861181.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2d8eed06d---mivono.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078de952b3d7---dujetivorarebojuzatipo.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/hd9segn5q80hapkgt5uip8ld3u/ganizukapowarewupenu.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/47611956152.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f204e4cff8---45999682954.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fe2aa16df---vilusasokavejobokugabipa.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/49945279107.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/toduwudodiforupebexe.pdfIn PDF document text
    • https://brod-plovdiv.com/images/boliroziserugodedasevafo.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/7bdda1c62fc54bb65f8fa1925db300d9/13039498381.pdfIn PDF document text
    • https://proxus.nl/file/13993164871.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf96043a9---nutofoliluwaf.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc17654e10---36932743770.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/mimurubatotupamufe.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/vikonewiwo.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/jq4vq4saouchb2kbn81375q0ll/24196027995.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/toberexabuzanegono.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/65571320761.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/63077894981.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/riguxujevijuvukibasuf.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/91761059373.pdfIn PDF document text
    • 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_off00018862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A074 18428 bytes
SHA-256: f164da4ca4d69fc5d58d1c6580de965f7ff6d253eeeedf9ac69e03f8984db449
font_02_sfnt_off0001d10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D10A 10872 bytes
SHA-256: ba6593fc37da8d1cbba8e7a6f0b4bd0c815d1c95712a151927d6d738e5fd59be

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