Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f0923c31716912…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 12:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 28105d9a2bf9c098bf744bc468406183 SHA-1: 45b187d951c921d5ec006fd4227905e69c89643a SHA-256: 48f0923c3171691262d3503701a645bc541dd2042cd8cba281116c35c04a6e50
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to other PDF files hosted on compromised CMS upload storage and disposable hosting. The embedded URLs suggest a phishing or malware distribution campaign, likely aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irina-beha.com/ckfinder/userfiles/files/lajimumowuvagosapemomipu.pdf In PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210914114840_480882229.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613887dd3a63a---32592109314.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/zorusugexepinenusizotoke.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/muwigozuv.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/47475662890.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/beviwovenogadijasuteker.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/gofekawaraj.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e27c466604---kuwenewipusotakotum.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161441ae402bb4---65357766872.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/11653627091.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3454bd23b---83126438117.pdfIn PDF document text
    • http://apcmagon.com/userfiles/90527641006.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/57863047583.pdfIn PDF document text
    • http://hasyo.net/files/file/2180634623.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/95217723186.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/vutelilefu.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/lebaxud.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/83905252483.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/53639325690.pdfIn PDF document text
    • https://cmoretv.com/userfiles/16627543018.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/77934517524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=harry+potter+sorcerer%27s+stone+movie+streamingPDF 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_off0000adc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC0 15656 bytes
SHA-256: 96730c90eaebb972225337503f17eb963eed06e26e1dcff7a886aa7a9db2f9fb
font_01_sfnt_off0000d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 10876 bytes
SHA-256: de0b1cbe60e6bb7b7033f5792c0ac7106f37428f9e48107a580bfd5b7f717f27
font_02_sfnt_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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