Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47c6128b71a545c…

MALICIOUS

PDF

98.3 KB Created: 2021-08-08 03:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5358a586239a1bda63d788ea19f004b3 SHA-1: 4ccbd36dce82186eb8b09ace7bfbc29cc2b96042 SHA-256: e47c6128b71a545c8e26e3e69ae5142768ed5c0f82787bb6769bc7edeae06a97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection suggests an attempt to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://easyreturn.store/userfiles/file/gixunojekegef.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4f810818---13791207367.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd1e0c79d5---60755312246.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81f7915d5---kujukuvo.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/58173630217.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c9ab90fe6fbba0760ecd20db14ae1905/79152722403.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/38225849587.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2ffde6139---wolutoz.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/j5oupjj8oelk7f0u02jikk0ae5/gemoredaxubifesakavixut.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f188c0fc77---jokiruwobuxuzitebarun.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0718ild4kokkfud6kfm6122jq2/3108151451.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/9cfce6336945809f57f0e31c07a4f1c8/bolaruzamidekolefevikekek.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/e9pf8mreecut4odumr2n6v6at2/lopefusarewa.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7urn7k80lckudsshi609v695t4/dafat.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bf2bf2984---fobavifudijivunujat.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/nufowulumud.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/53737181594.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/vafepefizofudikekisetesef.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/fitazemilusolumimafutorix.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/36686533110.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/8oudfk2oarpqq5lno8gebfd5b7/gumosikumezizad.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6a431b2850a7ed10072df6283a5244a1/popilarovazunoxove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dr+umar+johnson+youtube+2019PDF 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_off000114c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD8 11184 bytes
SHA-256: acdb20ba90d0c34f47ec01f5e5da3a545f7d59990caa0f4dc6f0afe6df75eca6
font_02_sfnt_off000146fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FC 20112 bytes
SHA-256: c5dec429a3e0fede4108a6eee6727620722886044cabfc3303cba7cfb5ca2f13

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