Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a8bdf1b3e4489e…

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 02:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbb534b16ac15d983ea6f48a24716769 SHA-1: 562dca72a901e49ee25ac44dffb6591b8928167b SHA-256: 40a8bdf1b3e4489ea427630b7706e6be453e1c45cf987a5ba01f38718c08ad35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://phukienbep.net/media/files/86268574791.pdf In PDF document text
    • http://all-vehicle.net/js/upload/files/55066314329.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161416bbedf467---33753071182.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/fonete.pdfIn PDF document text
    • https://aromamarketing.md/img/files/wikimuzedebimup.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614048d999799---lepidari.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142f66091431---pawurepawulub.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/24415730341.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/kevetujekizota.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/37010331379.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/vutemuvonikubupotowijevu.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109131430117920.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/16645708498.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/38972270239.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/risevirezaxodusubi.pdfIn PDF document text
    • https://porfic.com/fotos/file/xekubizum.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/foser.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/34416693780.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/loduga.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/60224219137.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/33596927001.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/20990971167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=queen+of+the+damned+watch+full+moviePDF 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_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 10784 bytes
SHA-256: 3c96ad56f4df86024e46fab5adeb3f5752431733d97fbf95b512e03f63891b62
font_02_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 17596 bytes
SHA-256: a8bc317a8680d05d514ca1f4c666c93042842ab7a56b1283ac446b2cfb2f81be

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