Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82be661f3918b72…

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 12:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3f832719945e9fcffb49f3faed5379cc SHA-1: 3892cb805c7cc3776d2fc1ea9cd3881fdbd0eebd SHA-256: f82be661f3918b72df8ce2594c359c726919b8c0c5f3b6c72f8997a755a5d974
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified the PDF as a link farm, with many URLs pointing to compromised or disposable hosting domains. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://florerialafloresta.com/ckfinder/userfiles/files/35910397495.pdf In PDF document text
    • http://tdbm.vn/upload/files/64975876507.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/xabagokupetefagakujul.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160786072435d6---41418311688.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/8582079580.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/wavivulekeje.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/rajaxaxatumov.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/21300291944.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/wagasesilaraseki.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/tupopowosizavuwatufemeb.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/vagutijudexatupatekarubek.pdfIn PDF document text
    • http://bamila.vn/luutru/files/45510557145.pdfIn PDF document text
    • https://mauspro.net/upload/files/88147554729.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/14424011229.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/h83vh76pjpjmtba0t0cc0469fj/54075051380.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/98219517517.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/kamigesedufe.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a74b6c9f10c---zovobupajukinekapakab.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/73995705676.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08463cf6f---zuwazel.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160847105cc361---77239804652.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/senumexora.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/5522752277.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c18a53b0f9f5fb91fcc40f1da563764f/52142347441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=proceso+de+fundicion+de+metales+pdfPDF 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_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 17680 bytes
SHA-256: 075a9e1656827e3a2b26e0f423310778d3ce585e871bb2820087ece54ffe07c6
font_02_sfnt_off000137c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C8 10884 bytes
SHA-256: 6956d39759a9dcafaa0d794165016556e748b8606f6b8c1937ca596a2a5a874e