Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d748b4bc74b681b…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 05:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: adb71ea1a38a2ee50e0da506eebb0342 SHA-1: 67d9adc5a7a7a79d83bd52becb73d11fef2f77f0 SHA-256: 3d748b4bc74b681b4f1b9faa04c73a8521a7509e277d38990ac4cae5d0e3f8fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=dream+league+2017+file+download PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142710cab8e0---59764396560.pdfIn PDF document text
    • http://chamdure.com/DATA/files/94965933729.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/satomukane.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210910195018.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/21180715209.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/wujagigafuka.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613432c4a4864---53979287315.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/posagakujebefigun.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/davirutuzumuwusitudumix.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/bezixiludasirefazofex.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/58371759796.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a1a65145ff344d79b99ea8a47b86cd0a/vijetetiliz.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/29227857933.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/27590565350.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/90155076369.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0fb84144---3928166926.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/84129605676.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/23254134495.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/41016147516.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/77999119829.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614eabcc90b76---waxikadota.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/pijepevefifuxu.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/47275610240.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_off0000af29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF29 10964 bytes
SHA-256: db83308c166763d746879ef1e3ec707036912df748aacff428972e924dfcf4f1
font_01_sfnt_off0000c884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE096 16312 bytes
SHA-256: 2f68bee31bc97e723d42fe5d2189037348a4ede354a819de2fb57893fd664cfe