Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7cdb37db62847d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 15:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 97ac0a93dc8a51ec4eeff334884d2789 SHA-1: 31c0561456b4f524edb4ee41307a1c882cac3463 SHA-256: bc7cdb37db62847d6f405fac8cb5646cbd7234ec87aec143ca96d9b1ee010018
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple external URLs, several of which are hosted on compromised or disposable domains, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards a malicious workflow designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://agronlogistics.com/userfiles/files/77828751711.pdf In PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141d1a629c9d---najaxezubeg.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/994qp3sl0ghqm2nicrp46mljg3/16288570062.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/sabozetofaretoxit.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/weminotuvubaxexakepibunod.pdfIn PDF document text
    • http://abnicum.ru/files/file/23471953527.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/rakotixugesijawaf.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/xaburotuwuka.pdfIn PDF document text
    • https://fong-cai.com/upload/files/47861955787.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/tefulupojizoni.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/vutisobafodag.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/reforiwejim.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/nosaxolawijus.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/3115352500.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/90564562607.pdfIn PDF document text
    • https://vestol.bg/files/file/23280378592.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc339e949---kuwajabidatujazexadeni.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/78397255237.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/7773937558.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/fimugod.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/2029968289.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e8566cad---sowokuwuzinagosuda.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/siwomotejajanogunega.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/sapoxazovakadeludajedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+share+files+from+phone+to+phonePDF 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_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 17840 bytes
SHA-256: 2edb3f1fce97161c09e9bc358dc38299d43fd9d38cfa5a2a4ba751ed9c717e77
font_01_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 10700 bytes
SHA-256: d5fe7b855a1716e25a3873d62c19e97791a75750c8fa09fcc9e3133af07776a3
font_02_sfnt_off000120ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1