Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c030ae83e7898a…

MALICIOUS

PDF

68.7 KB Created: 2021-09-13 14:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8b5bf5fdcbd8e3e56a1a21c2a118481 SHA-1: 687f28dd93c67ce5f6eb6b13713029dce0839998 SHA-256: c8c030ae83e7898a1c9c1fb21b1d1cb9241e75ff211f6e0faab4a15d3c1b28f6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external URIs and the 'SE_LOLBIN_RUN_COMMAND' heuristic suggest potential execution of commands or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://etest.vn/app/webroot/uploads/files/dawesodijovuluroranati.pdf In PDF document text
    • https://die-elke.de/cms/elke_page_files/file/17973178673.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/85134622836.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/66102553148.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/80661816248.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/79535872615.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kiruzuzebupetafujaxabidab.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/vereliboriboz.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/b05f031391f0a41a4798d1638df5a7e7/patalulozuzanev.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/95383999763.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/mijoludije.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/pedakezezokugefosevak.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/82609015197.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109042346515130.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/864fa6d3aa3a95ee6d13068a96c92981/51690598238.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/52250743708.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2bf569c7---rugiw.pdfIn PDF document text
    • http://suurelepa.ee/data/file/8877913435.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/bigur.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/81502390617.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/61909141664.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/diwosekil.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/kdv2c1kincpvjnn947p7h7lm46/89287483814.pdfIn PDF document text
    • http://qdcmd.com/data/files/nonuwaritofemex.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/mexexidalewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pretty+woman+123moviesPDF 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_off0000b04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04A 10836 bytes
SHA-256: d05d403c39909d9b10b11048c212d1b05217722d3c9325de6719eb9f61a1e7ab
font_01_sfnt_off0000c97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97D 14444 bytes
SHA-256: 206bf2adf6f37df6c58a6b05c27301dfdd859fe1a1ec2e4f19056ab254f91587
font_02_sfnt_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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