Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd04c5a848a2863…

MALICIOUS

PDF

98.6 KB Created: 2021-07-20 19:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8268fe980bc7ceea91938a4a7118886c SHA-1: 8b50740981d74e091c311742a4612713a507c778 SHA-256: 1cd04c5a848a2863b7d7e5349744cdd0e58cbdca761bc0ddaa1410b483ca3179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely as part of a phishing or content-luring campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9326

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 https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/299214f0765ef5d1757bc48cbe6dedd0/19034885284.pdf In PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/6tabdaub1usgeshogd2s6gtuk0/toromuw.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/rtoqide93cnpq8o5j9kgt5qc0h/59014994315.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/dgf5rp4iqp9pnmtf1kq1thb7h7/65869176864.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3119be3a2---79996399896.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/xarenoso.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073165d4f941---zupuxatokukusa.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5c9a1cfa802fb2ba83775d90eca88118/53626197724.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/97128039479.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/2555215687.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a771024301f1bc79a15b6a8923da6130/berana.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/95215842694.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608595d1ee67b---jofurevexum.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/53520389449.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7a8670f6279f3d18c1bcadf6cc432430/79201913850.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba92e8ffe4---wobuvufizozojademud.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/51170080670.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/23797945018.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160727ef0ce8e0---5702376128.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/473cda8c323f97c75b4d19ce8296cde9/47062333298.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/85101387110.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/telexog.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7ba69ee31d4d2f5da906ad50f31889eb/bawatitivaligekozugog.pdfIn PDF document text
    • http://webursitet.org/Files/file/74185124150.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607036a6ad701---7521984248.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021612143527135.pdfIn PDF document text
    • https://oliogalanis.com/file/1342532560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=inconspicuous+meaning+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010e13.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10E13 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 10668 bytes
SHA-256: fad8743484222fcb50a54c0dea06a2e0ecf1b5bc7df8e78ad80cc68f0c30b15c
font_01_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off00012bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000143c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C6 22632 bytes
SHA-256: 544743c034b9590efb5863b08197e42818dec205421e95e564a704de926d2aa9