Malicious PDF — malware analysis report

Static analysis result for SHA-256 9311fe003d1d9e9a…

MALICIOUS

PDF

154.4 KB Created: 2021-08-10 22:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 185efe57e6a2a6dafbf4a972a54d0011 SHA-1: a2dd30d88d9f3d01fc6a16c8668f0d9cb49e83d7 SHA-256: 9311fe003d1d9e9aabd60226096551647fcb36f1679414880375fe56a0f553b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of these links and the detection results strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://huntic.ru/uplcv?utm_term=what+is+beer+lambert+law+pdf PDF link annotation
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c314ce0cef---nepugi.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/14966402092.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/dowovogi.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/bosorafadaje.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c610736f4a86f48f1043f46ab11af5ae/lazepopavevizevot.pdfIn PDF document text
    • https://afayl.com/userfiles/file/ranololonatus.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab4b73b3c---27286718404.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/nogewuwomeromufofejari.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/35586440912.pdfIn PDF document text
    • https://fultoys.com/userfiles/medifisidadogimaj.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160849724700c0---20001768771.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/1651123164.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/natomizupifoj.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/4khlnkhauuqpno1off1cuttcum/mujejupuropagovovilabale.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/a70c7f55e4904d291089c75a2d3eb019/62075630021.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad2349f9b---kelonuto.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25e7532b13---xeveletikaxirunij.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077a2077d5bc---75646992648.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/jemudimifodufibenevapox.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943a18768e9---92961438175.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7a89927f2---bifudopejizedo.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b8b5e8c14---58137688195.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xezokikuxu.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/fe3f90a8a791c88c8b64d05ef45dbf2d/daxijurikerufovin.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_off0001f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CEC 10756 bytes
SHA-256: 59237f39a14e6505b56fe646e5e0bd5dbd594e74297adac31c38c9d31e8ec561
font_02_sfnt_off0002257b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2257B 20596 bytes
SHA-256: eeba0bc06d3d72bb2a7c3f230b56c69305c94bd88301843a490de4279709b7e8

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