Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e96e65a1bdb54c1…

MALICIOUS

PDF

74.3 KB Created: 2021-08-30 17:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 664e06d9d3a1ef8d98ae7e54f42b8b8d SHA-1: 47142223675015ba11cc48a6f75cc40f8197bad4 SHA-256: 5e96e65a1bdb54c1a0f67c5c1380060770b62281f8c86d62d13474c4606b8466
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/54f232b0a746ded5968801c75a6cd403/livuribusidelevanedena.pdf In PDF document text
    • http://mail-business.ru/uploads/file/39807797804.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/roxebotavipeti.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/zevokozon.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/71276444460dbc6588c764.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/nujatufefexitoxaxo.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/64171097590.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a440869605d---27533377356.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17748001478.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c10c7e31d2---rivuzabijukafa.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/e906a518a042c13d79c234fe5700c808/jexazokenuwemozumagekurid.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/l4p9lu0hbkqiapj3pcvffs8616kb6q2b/258706973.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210625231027.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/26038432505.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e20c51267---todow.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/95464341980.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f684bf05b---30452769452.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/gujubizudomobabin.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/08/06/file/20210806_043032_106.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/87432013034.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ck4ba3tn7o1suc08789e16iqi0/wudonel.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/sukonideluno.pdfIn PDF document text
    • http://turnyras.lt/Files/file/wosizuduge.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/fewexititivusiruzakaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=jerry+garcia+band+chordsPDF 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_off0000bf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1C 10752 bytes
SHA-256: 70caf493e456acf3cdfe019c546a0964939968288e2ecf0655bd315eae1ba3a7
font_01_sfnt_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 16812 bytes
SHA-256: fa95b10525ce8788ebfc99bcb334eb169f76199884a0375e9c8dc8cdcf6156b0
font_02_sfnt_off0001030c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1