Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c8b2eb333328d0…

MALICIOUS

PDF

78.0 KB Created: 2021-08-09 21:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: eab0b16ece78f6d99e22ec6e4844fc3f SHA-1: 986c5e7592caa0053e55c77c76ae9fcaa0562970 SHA-256: d2c8b2eb333328d0cd0e573e3581caf05844bda3eaed9323e9ba2bbeb6614e4a
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 0.9948

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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qpolssst8437421ei0bhrkmnd0/32611017384.pdf In PDF document text
    • http://ottotech.center/userfiles/file/vafunapafizixovunug.pdfIn PDF document text
    • http://maihome.hu/admin1/file/30575811506.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096767c77e74---62504507466.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/rezidevoxenukamowubo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/16ea48b2c72a577eb60beab6282e790e/6061218566.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5489d5d2b---zoletumivopaminotenonutip.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/rawidetazalur.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b200a46ca58---13074548933.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/48371390747.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a806b57561e---63423953557.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/70350892686.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/puzikig.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/ruzewojizawikexujiso.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91ed12929---rutelafinixesigazapimaluf.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/juxezudanixinutobalutuvu.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/wufikixegatoten.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c0e0f255---38627712573.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/78282082961.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/31505439608.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/d5vgvv9h3nj67p84sj3p7hms2p/dezebafe.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/57648541576.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/48622890631.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/36310362139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+fastest+electric+go+kartPDF 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_off0000ce43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE43 16780 bytes
SHA-256: e3e830c579de360063cddcfc15ff0c8c6afc3515e0cf9d0ee3100073b69f3e6e
font_01_sfnt_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 10596 bytes
SHA-256: e8b4698c4a5b222dc67bbabf6db273067665a1d3f7dafd38657dc568a0fa5929