Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4561e2a42f080f5…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 05:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f0a7c13fa4e13261e069dc7ebfcb3aab SHA-1: e46b235348575bc191c1c570ab4a13eedda262b9 SHA-256: b4561e2a42f080f5c0207c93e3559fb4fd860d635b0702fbd3da1dca68b3c934
164 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the intent to trick users into downloading a payload. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=class+11+english+core+sample+papers+pdf PDF link annotation
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160723838791f1---20166727640.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/gaguzalalekoguk.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/voriweforaligif.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/83885400113.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093e66371bb6---97265402743.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/7a53d5fb7b32bb385f87eff6042e7a8b/32984455775.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/vusidixalisuwojedolinuxuz.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/xepibavoj.pdfIn PDF document text
    • http://ustunongel.com/image/files/widijogedom.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/pidavufidelijilutitur.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f27aabb2389---mebakosukatikixepetiw.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/msla4nf9uc03jvu1tthkecadda/waviworatogolejupezaduz.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/1960530845.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/39089325292.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/legutupedinab.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/18540401442.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/72778403398.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/32955341373.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f29ebb5ca2e---67496304200.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b5cd4965---59429863011.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e72eb69596e---vanujumokavojefisinep.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100487655f17---kelitepegaxulefupawalep.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_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 11052 bytes
SHA-256: 849c5211a65e5257ab57ef49a27ceb57068dd331e2da43460f470162a26b53be
font_01_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 16928 bytes
SHA-256: 64469a6127fd6c4f20e0b929fc7b62f3dbbee74b43222933bc9f76f84ebf5e21
font_02_sfnt_off00012994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.