Malicious PDF — malware analysis report

Static analysis result for SHA-256 a870722dd47f5f77…

MALICIOUS

PDF

93.6 KB Created: 2021-08-10 06:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7df3f940d0325a86b58eb2b75bdb3080 SHA-1: e82c3028b1ea6c12f0c7b5b260460a536daa7196 SHA-256: a870722dd47f5f773bb4b99733455c19a9abd61242d1bb41031082f422951957
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 0.9990

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 http://johnmarzillier.com/ckfinder/userfiles/files/xabidudurasuvaxowefi.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/22df74f620251a0db2ccc73d45ef848f/25558547112.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/36578894858.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/774948fec6eabf8f52120bb9f526ced9/53172700641.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/fagoxozibafubalixegozos.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/hdavbtb01fbi13lpg291hrmqgm/618209526.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a15bb2f3695---1371366751.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/datageribapatalikabar.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e44a90308ce---58741897997.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609badaaeb3e6---faked.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/lagiregapewufone.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/19506003380.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/72026368950.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/40225165474.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/vubadutov.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/fuvomemep.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/litigojuxojixibajigesati.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3d7e30c6796dbaa8bf5039370b672046/50697734356.pdfIn PDF document text
    • http://beateromer.com/bilder/file/31770894629.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/5801477614.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/98057036151.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64eb71a3c7---mumapipijomeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B1%D0%BE%D0%B9+%D1%81+%D1%82%D0%B5%D0%BD%D1%8C%D1%8E+2+%D0%BD%D0%B0+%D0%BA%D0%BE%D0%BC%D0%BF%D1%8C%D1%8E%D1%82%D0%B5%D1%80+%D1%87%D0%B5%D1%80%D0%B5%D0%B7+%D1%82%D0%BE%D1%80%D1%80%D0%B5%D0%BD%D1%82%D0%B0PDF 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_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 11196 bytes
SHA-256: fb4d0942cb9cabb07b8de6a93d482a0848545dcbbde47e74ba07215e01f37816
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 23048 bytes
SHA-256: eadbb728dfd3ea80f7f4968346d86b88343a06da6ac0f1bae934697c17f9ea7f
font_03_sfnt_off00014bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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