Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebb22b812375482…

MALICIOUS

PDF

74.7 KB Created: 2021-10-04 06:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e75e2a8f0d75cd58653aac5dd871a6df SHA-1: 6ccb8c5542da79c52ef8b11e519a62d050ab7e1c SHA-256: cebb22b8123754823c0fdc52c137e8188a03fb61f6b480f6598abb5a74003dc4
176 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to compromised CMS uploads and disposable hosting sites. The document body is unreadable binary data, but the heuristics indicate a malicious intent to redirect users through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://evaemlak.com/userfiles/file///55295576640.pdf In PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/15613846996.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/labasuzotej.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/5fcjahscrjj5k7i26jjgbrnc51/furin.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153073f01574---10186281161.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/xexemanawezoxowukal.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/63243063777.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/gupiwarexanakurejareva.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/wibuvoz.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c929657da---55830405510.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/2060390475.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/dedeworaxebisejilokasa.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/23934750706.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/jedisujomam.pdfIn PDF document text
    • http://idroter.org/userfiles/files/jozukisupuluxewure.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/95787893732.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/rosobome.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/wodikosepusujiwisinonaw.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/34456952882.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/rijaz.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/11287900508.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/rebopofenupubugufo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe185e22ed---duvuno.pdfIn PDF document text
    • http://dsfly.com/uploads/files/zunuzizolilex.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/26534154060.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109080905529539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=update+by+joining+two+tablesPDF 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_off0000bd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD44 10944 bytes
SHA-256: f7b88bcde03740af9654c8c029797e246abad29a6fc6131b80387859dfb151bf
font_01_sfnt_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 17928 bytes
SHA-256: 0b90cbd4d2942d34c6c208456e6371bca04466e7c18e82f1229d8dd77ed6b89a

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