Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ce28bf2f7487c5…

MALICIOUS

PDF

89.8 KB Created: 2021-07-05 10:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2fe2ab0784a5efe045bbf4b4f5843089 SHA-1: f55646f70ee18fbb6ca70a19c272da1ef53b38de SHA-256: b7ce28bf2f7487c5006ec629c3323f67e0b942dd7b6d086e6380545eee6c1acd
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or deliver malicious content. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's content is designed to trick users into revealing sensitive recovery information, such as private keys or backup codes. The presence of numerous external URIs, many pointing to compromised WordPress sites, suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9733t7f8elh080ae4dk4cmbkvv/14920702848.pdf In PDF document text
    • http://dush-kz.ru/uploads/fck/file/52105822171.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k09gfp2c4f9lre0gmphse15r57/waterirosinaton.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/20167857434.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/625f58dc437846cd40cfebb9f482a2a8/vamazalabodabu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98ced01cc0---soroliwowozitidikul.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/ddca3e359cb9da0e5fb4a9e8acfcdce4/busegaxuzulas.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/64984572447.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/c4da444bb51acd32eaf1e9860e718ada/77798851892.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/zifimuderoketoxafikuguje.pdfIn PDF document text
    • https://aspirans.com/files/file/kufuw.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608539cbda939---zizime.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/8283db98c041932dd05ee75b853ad3ba/25492887841.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/jekutawerevev.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/e9694b9b3cca64309abef2516a3af957/lisemimig.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8f50c78ae875668476e96c83fe8fba5d/jaravevivusuzetoki.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0ebb4f615f541f3c7dedff89327fda7d/19227864119.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a74514b64b52cab0d95afbd1d5d4197a/40452662271.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a402b28b2c---85536846433.pdfIn PDF document text
    • http://valeneighbors.com/userimages/sumagez.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/giporulularofedulon.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/38256965839.pdfIn PDF document text
    • http://$user:$pass@ProxyServerAddress:PortIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=linux+export+http_proxyPDF 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_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 10276 bytes
SHA-256: 09b02b39aed4bac4ba422414255d0617aa68fa82283830fc180ca7ba179b923b
font_01_sfnt_off000111a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A2 18352 bytes
SHA-256: 54d303c2cc9d29f0a8a57a0a6c79333aa50e8f27390dd430180d1ab469702a79
font_02_sfnt_off000142d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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