Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77d7b9d3feaa781…

MALICIOUS

PDF

86.0 KB Created: 2021-08-06 09:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3ba6871ef80633b2da6c8b08d573a02 SHA-1: 7378bd48ef4088e7ae42d3eb158ea43084bd4e65 SHA-256: e77d7b9d3feaa7812c1adf448a2931cb3d78956d98f2968626e0aa6c5d66b890
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document acts as a link farm and employs a password-protected archive lure, suggesting it's designed to trick users into downloading a payload. The embedded URLs point to potentially compromised domains, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=gta+5+android+download+highly+compressed+mediaf%C4%B1re PDF link annotation
    • https://cambodiadriverservice.com/userfiles/file/wurusosuladotalenujol.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/94486830158.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/56129642247.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/fepedegol.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e8d5d5222---35452485236.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/51440061504.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/69108567736.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/95730786274.pdfIn PDF document text
    • http://www.toptehnik.si/images/21950414650.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///fugol.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/xiwemobixopuxezifilobavin.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/29937426918.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/72kvcud6tn43jm54u708lnluup/jogawezafakidugidor.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e05532e65d6---47233313785.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a556a2afab9---dojobiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7090ff2b5d---52462546116.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e8fe996ed---dobukov.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af99675afb6---32167042285.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/9bq7bh5nh6j1s5mfhdmdfi8otu/xokejigopuja.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/51456287147.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/kb40827493utaqt88rva1ojrin/68414623585.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95d513591---rozupugarudixivaw.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf58151ea75---fonojiv.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hgoo0gk61n97h4e0in6ih9q9u7/gojodugufiritafazofovela.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/88980623669.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_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 17288 bytes
SHA-256: 14860a488235516f23f3ecd1bf1b5a9a5208647f5036b8f94fa9aa4ff6f79305
font_01_sfnt_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B63 11484 bytes
SHA-256: 30f39a3544a44d808fb5f5a450e4aef8775401ce14f9ba457ff1741b41a2f56d