Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d56115a497e52b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 08:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7902e0d3989922b06356c613e4596c6b SHA-1: 2ad25a8624c56b55b6d3eac96f01ce3f0d339096 SHA-256: 58d56115a497e52bc39fdde97aa4b412d652922b29c8edcbeff6011427684eaa
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites, suggesting a phishing or credential harvesting attempt. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document explicitly requests sensitive recovery information, such as private keys or backup codes, which is a strong indicator of a social engineering attack. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=adb+fastboot+ubuntu PDF link annotation
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/85dabc649bee9ad505799a9d232b53d4/48423914968.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/27275590747.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/64752614234.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/rixeputuvafuritirukamoja.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/36757361291.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qolhe0ct66qpqeftcdvf02l0oo/luwowimariguv.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/dunelumewimemeve.pdfIn PDF document text
    • http://espicycooking.com/files/file///mowoxosafowita.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/69115113269.pdfIn PDF document text
    • http://mobitransjogja.com/files/pabowivobikekorewavopije.pdfIn PDF document text
    • http://retrofotr.cz/files/file/28497651704.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/72805713486.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/zinexesudubumivededib.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/wegabelobarimuse.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/62fbf42236f6f9c72f1b42674d4bac96/59913880625.pdfIn PDF document text
    • https://satesayap.com/contents/files/26143507869.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/kuwirejudukoj.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/81281169871.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/posinowomubete.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/53503012674.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/1681587931.pdfIn 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://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_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D3 10200 bytes
SHA-256: 60b74980eb25c7a4834b7c2dd62782c925007e68238dc0a55d860ea4d7f1c5eb
font_02_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 17676 bytes
SHA-256: a45ce4c287a16bd8bc5fc15658f73dc71d30153a842260e619f00eb7996e5af4

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