Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1da37de396ab355…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 22:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da7dcabcf7611242a55eb84259ae8f82 SHA-1: d03cd1c0404349822802535c4bcb6e5fa0933b21 SHA-256: a1da37de396ab35586e00eeee2b23cec7dea962b089fd4cbac771195c420f2f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, embedding numerous URLs that point to potentially compromised websites, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://krisoc.ru/uplcv?utm_term=inner+and+outer+planets+worksheet+pdf PDF link annotation
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16082da6e4ebbd---74345712805.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/bdc0dbf386585680b1dd38a8b6547910/28980396118.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d72f6752fdb3a3b40ab1e9c3ffbfea61/27517879943.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/pufadamoxed.pdfIn PDF document text
    • http://gujaratbusinesspages.com/userfiles/file/96204007748.pdfIn PDF document text
    • http://lawngo.net/fckfiles/xomiriwopepifisiwu.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210804100456.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/81186362478.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/27811780512.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/zufinamegegovaloz.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tizosubifulexafev.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a04d08c012---24898398174.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31352038397.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/kevimixutep.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114a12d0add9---94017092143.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/zenivamarorusijenujagefe.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/19835849797.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/wulusoritiwexudolodow.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160761699876d9---61061895819.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/deluzeta.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/wuzamuvu.pdfIn PDF document text
    • http://land89.com/ckupload/files/mogizuwuzaxupamogarinore.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/nigatepeluxu.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/73452091110.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2bf13c96e141a9b9dfc42dc02bd465e2/jubixanalanukaxofupikox.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_off0000ce1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 17312 bytes
SHA-256: 5777bce465a4dedc831b462c45ba1f9e9ea85d00506672d95c9486112d0dc53f
font_01_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 10732 bytes
SHA-256: 27736d8554fcad58ff67a6057ba343fcac68cdb46140b1dbcbe50141ba93465c
font_02_sfnt_off00011378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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