Malicious PDF — malware analysis report

Static analysis result for SHA-256 44616c01b5a21a07…

MALICIOUS

PDF

75.4 KB Created: 2021-09-11 21:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e87d53d5d5bb240dddb40e1c0ab4321e SHA-1: 54417c34cc973e03927c19444b26ae8ccc5edec9 SHA-256: 44616c01b5a21a07ee328d67cf824dcfa8e06543c466937841e58bfa7e5a9e22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting. These links appear to form a link farm designed to direct users to download content, as suggested by the 'underground 2 download apk' UTM parameter in one of the URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bischofs-scheune.de/userfiles/file/wadatekulotudikiboxig.pdf In PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/70837497998.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/raguzil.pdfIn PDF document text
    • http://irinabailey.com/upload/files/zatoxil.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/siwubex.pdfIn PDF document text
    • http://glassick.com/userfiles/file/816688404.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/bogolekaruwim.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210910214922_547854897.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138c87e054cc---55007407073.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161331fbdeb57b---66555912030.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131684b359af---zefeliwigelorivotiroluku.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/wuxagu.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/kinavopupezi.pdfIn PDF document text
    • https://seikai.jp/free_images/files/87334718720.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/15335517935.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/74047577159.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/gojit.pdfIn PDF document text
    • http://artospace.com/pics/file/vejotipus.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/17341517242.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/rifatobitibelo.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/96028146724.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/vixejojugumudixatamaji.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/2233745357.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/76771287842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=underground+2+download+apkPDF 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_off0000c14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14A 17864 bytes
SHA-256: 355360ff923fb534a03c12b0d145e77dd06d0c6e67a221bda632e5af748d14b1
font_01_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 10616 bytes
SHA-256: 718c43c4d6357023c36624efdc060455847ad13cc0c8238319fc49ff3c325939

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