Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bbf89714da3a0f…

MALICIOUS

PDF

86.6 KB Created: 2021-08-07 08:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc6efdcbe37ff78436176aa28ae776ba SHA-1: 52c53e0994d4179fe5d7816f6e751e2d4d18409c SHA-256: 44bbf89714da3a0f25b9da0bc4bbe405bb9b86cbcdc265546ec45255fd19270f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs suggest a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c48b7e304ec807e6b9489548563b5854/maxewibitine.pdf In PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/rakidonaxulume.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/nedijaxudadu.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/83540885314.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/manixoxelug.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb385d79d1---4106151433.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75b2351e49---dasom.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/2474109686.pdfIn PDF document text
    • https://avenue102.com/uploads/file/winezemutefe.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/73b032737aff454e6e1b3cf37585957f/28172779939.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa86c9b2c0---63753109782.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/kowukavakozini.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/37937787730.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/29715086338.pdfIn PDF document text
    • https://advik.net/userfiles/file/81741226302.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/pvhh8hdh2egjrvtslmjl2todh2/digozurovavuvenididumu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ca095f0f4e23ecf79493031272795cfe/55072887320.pdfIn PDF document text
    • http://amajyuku.com/files/files/40134525518.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/nixisebaninuseputifuti.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/nejutokuwok.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610a8f7a938f0---nelidupalis.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/34968559294.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/44957882232.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/11813768893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gunship+battle+mod+apk+%2B+obbPDF 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_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 16708 bytes
SHA-256: 79e1045d8156860a7c0fc2e5a594cd2b319925fa037b9404101b35b819c20ce0
font_01_sfnt_off00011bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 10928 bytes
SHA-256: 2c86b75886a7fce67e02733f0792e16de21ab0b0b866072e391dc1fc4ff5cb9c
font_02_sfnt_off000134b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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