Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e48b3d948963e8…

MALICIOUS

PDF

85.6 KB Created: 2021-07-08 12:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8160bcee22894bdba06f2c1a556bf8cb SHA-1: 5b966358baa79f3904014be3ac08aefedbb9cb86 SHA-256: 85e48b3d948963e8a297d98b14dc16739b7562f450a6d28ff373c1d7fc67b90d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggest an attempt to lure the user into downloading a malicious browser extension or update. The primary goal appears to be social engineering for credential theft or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b49dfd25ad5d9325d261a9aa4bc60876/josulokebewi.pdf In PDF document text
    • http://musclecar-taps.com/js/upload/files/61379516658.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9d093a11cdf53c469976a9c4af46326c/xuvupovozulekub.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607182a8bccf0---77270923103.pdfIn PDF document text
    • https://belloverde.net/emailer/file/12486771977.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/26283349239.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/8648887846.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d00fa3f9d---851511943.pdfIn PDF document text
    • http://landpas.pl/upload/file/gegulafogoxanoweruvugo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ad0fc9281f73316efdbf1acc0c964355/74155853751.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/pupapameraxemonakuga.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160820b5e06e43---pezezumikufowadebekebi.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f848fd831117ded569073dd8461c6252/babikegejo.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/aac6582a2615c4db8074ad87b0c55e6c/ziwajiv.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/lalatepojeta.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967ff79a3d0---24209328127.pdfIn PDF document text
    • https://dm288.com/slicice/file/zetofesituxamex.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed19e7e61---tadowoginoramixomerus.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/94565596316.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/69902484722.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/manabiputodazobop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=internet+download+manager+addon+for+chromePDF 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_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 10700 bytes
SHA-256: 2227d02cac3a1dcd809b894f02cb3aad96b888941ed37583b4c36f354e73bc28
font_01_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 16864 bytes
SHA-256: f0c771c0a4f3910be3eca61262cdc05672e7bf74a70bdba8d3eeb31c232fb319
font_02_sfnt_off00012ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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