Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d62ae1a6fb4d361…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 20:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 922288cae82cd9f2dba0230a46135f8b SHA-1: 1126f72fa49ef5fc30f1f6e8f9c3bd9667ea0e7c SHA-256: 7d62ae1a6fb4d3612a3c2e26d5d716a61916d815e01d070acdc8cea2dcaa6419
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable domains, suggesting an attempt to lure users to malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c42ba54d39e1fc9e0b298d2423c4614f/nenepokizaraf.pdf In PDF document text
    • https://jobtiara.com/files/files/vabunowexogaxunutezo.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/pemolujo.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/nataregot.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/vokopuzovivogitisefuzizow.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/3163c3d97180e35e2b1b11c11f7bd76f/zirivororedexo.pdfIn PDF document text
    • https://daismene.it/file/56594194499.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/ponesunejamifoxe.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/94071774444.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/xarozebujatamowolojej.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609709462582c---setutofegiwalutesak.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d511b37f2f---85482001974.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/u6caiuirc36udukv0d5lvbauf5/mumuxurirorerufi.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f0b223b70628714edf857bda3a97e980/tefaxib.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/fupunisuti.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/16424316759.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/610d7468039e3.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210507100616.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/58734682376.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/hvqdcauk0d9nb4tqk0vjnlf9jg/dupujopuzaf.pdfIn PDF document text
    • http://arslanemlak.com/E/file/35620690528.pdfIn PDF document text
    • http://axwelindia.com/uploads/kutekixinakekal.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62cbdfb16---woweliden.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160814dfc8e8a9---xidetojoveluxoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=netsuke+carving+pdfPDF 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_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 10864 bytes
SHA-256: ae60715e516a45db2c25e71828b0d64963e7ac36de5641c92626dadb9b3962e5
font_01_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 17408 bytes
SHA-256: 715834a0987dbbc4e8bbeb09013c716707aa222b20e6d2db092e068ed3a52bf0