Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a352c3b9ef61d4d…

MALICIOUS

PDF

85.0 KB Created: 2021-08-05 04:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 2535cc98ff31b22f709382853017a45f SHA-1: 4cb5b2d0dc9dc937e77a6ace549b278d7e5477b9 SHA-256: 7a352c3b9ef61d4da4c1bbe19cb43037983a08cb32ba7d454939384b138b6f25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://dcmheavyequipment.com/admin/images/file/62220795950.pdf In PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/uksoa8onksajiqek7l9dm7kufm/pelezirufotax.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/n5l6e144o48hjvvqudnr0j5j03/supalizadetid.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/bbbcd82bf72a1c62d3a04ea10560bb92/livixamifapelirezoziwojir.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/6436117655.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2hj60ml0ejn7oq98uca2430tq2/340746291.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/722ef7900ae8ceef8abb43b0949ec4c5/xulilavezi.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/dajevegilezipotujobido.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7cb34f21e---rabotuvulodosirirunapi.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/kosigafo.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/10679874993.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/baxafepajovaw.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/44463872030.pdfIn PDF document text
    • http://idcla.net/upload/files/katemoxesesixegub.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00821e510b---22836370197.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160736ff657c92---vozopewukinit.pdfIn PDF document text
    • https://bestwaynepaltrek.com/ckfinder/userfiles/files/27039137370.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/59139299604.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/31073022820.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/588a08d4cc43a5991feb683967001cc4/puvexokupibiv.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/70958481609.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/kiwefegibanunazikinema.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/88063911957.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160adb390c7c43---pafivesen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+smart+launcher+3+pro+mod+apk+3.26.19PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08E 11712 bytes
SHA-256: f271852d7687c4ab275e88c169c13580ee2d77a9fbe347f0a17e03f0c87c3d74
font_01_sfnt_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 16832 bytes
SHA-256: d8b512f95171879cbc0f328499e8983ddfb15e2650860bcc317ffbf39962977f
font_02_sfnt_off00011845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00012dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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