Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be7713cfaa3b90e…

MALICIOUS

PDF

93.7 KB Created: 2021-06-17 16:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 78aaff4551322fda1dfd5f3a4c3014d5 SHA-1: cc1c98a9a7d57cf2fa4a209f7f8b5b9f9906dd44 SHA-256: 0be7713cfaa3b90e662f40b89963667e6538414ac558027a530ecbb35345dd53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

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://smidgel.ru/uplcv?utm_term=los+siete+habitos+de+la+gente+altamente+efectiva+stephen+r+covey PDF link annotation
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/dvht06jtlsl7iobqu3k5d6lf4s/33299706831.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/dinozutaxiwosozakiwonojek.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160822eb3bfe49---zutobo.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/43485202845.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2b2f665fac41d9bd5e546dba7620817d/96920458601.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kikikibaxefiwevujejuler.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9c12f43a776f3f4e529498e42bd18123/nevenafef.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090a9b6e2251---89104379982.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/57737599222.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/melukafujifet.pdfIn PDF document text
    • https://bselink.com/userfiles/file/zogodejazategokof.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/729ea81b443b2abeda0ec4a4985c1253/wazev.pdfIn PDF document text
    • https://naoshima-habitant.com/lawuperoduj.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/8cc8a12e28f0d4a05b716a46af91a2ba/nufilabuwegomobarugubido.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r1ft2877d10n42r8kcbk32091f/58985447669.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn 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_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 5600 bytes
SHA-256: 0e509a0f615f35ee937738109ab55249256cead77a34936eb4f9e74a64497be1
font_01_sfnt_off00011936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11936 13304 bytes
SHA-256: e9817094c75436a722cf1519b18d2683bd1868995978773a961aa3de39ccbb35
font_02_sfnt_off000143b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B5 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c
font_03_sfnt_off000158b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361