Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd25c20f2f5835a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 12:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fce959df49102866a6ba2d4d767a5132 SHA-1: f78c4993a4b32ae50522822112623d242c3cdefb SHA-256: fcd25c20f2f5835a2b5dc7162f3c49fee8bb801cc948d7c39a6fa889c5084010
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple unknown URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba59d5850---94799874307.pdf In PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/77995753096.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/gurowumujekuginitubegibim.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/32659160466.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/4e5919974930abb24db3028b2583a88f/69246400137.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134688e172d9---menozoxeloxugima.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/fudogalawisuwikiwaravifi.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/81996061105.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/subuzaw.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/39359273d95022cd8fd5ad7bf76dd716/60253038689.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b4f3bf3d---88635443203.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606e744c4fc8e---42233038381.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f9362668b---54098059506.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/wofifesaxenadu.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/94451351373.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4e22829fdf632023c8eea89a9a7b18be/wasoxofozajolalejevinunet.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd91e833b5---kekavadosot.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/23721901642.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/kimat.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/1778250846.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2687bf18ee---zurejoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=make+photo+into+pdf+iphonePDF 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_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 10368 bytes
SHA-256: 2fcce1a5bbe1878955a2411d4d99419c3317152646e27d3331e4c8b0f640a42e
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 18336 bytes
SHA-256: d19f617035a9556f696de66f30198c64e5e68d500ca5191debd8958050bcb6b3
font_02_sfnt_off00011f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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