Malicious PDF — malware analysis report

Static analysis result for SHA-256 b804c1b070274de8…

MALICIOUS

PDF

88.6 KB Created: 2021-07-20 16:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef4fe9e94b9a2977984313c86c032d8d SHA-1: 3d5f0c128517e542594998756b17633272c55d89 SHA-256: b804c1b070274de86a2d685120e737bd7fb6234f6623f819e3a9c1db47355550
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of numerous links to potentially malicious PDF files hosted on compromised sites indicates a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cd1660057---10915433453.pdf In PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/lovodukabagaxim.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4a27f366d55dfd01dcf66d2a4800b34a/55039015711.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/r5ir57q90plvhnoooq7v04e3il/xidawigunivewesigazal.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/33260035865.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/012r87f0irqf0tt4u18toaql41/41192749825.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef368dbb5b---40719028188.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/bajegevug.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/4684388463.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/93470465006.pdfIn PDF document text
    • http://93564497.com/userfiles/zujafoledigukos.pdfIn PDF document text
    • http://usmleworkout.com/files/file/vodezi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5qn69pbgl496j8i8qkb2d5ufbo/79735340715.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/93327177007.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/90081726647.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17a2f2959---wixed.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/nh7elo6gnci556i989tvsim2fm/xefodekibasarowakibadib.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/79653188932.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/luwalanib.pdfIn PDF document text
    • http://c-amc.com/upload/files/76017819921.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/lakedod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+a+tenantPDF 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_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 9932 bytes
SHA-256: 16c3d7dd446b92dbb0266dd1fee45b9734d669ceb8f67695976615200b0ec7f6
font_01_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 16452 bytes
SHA-256: 9f50233606124ea33d1e543d0bff91d30a4b1da57f61231e10050e268e214cc8
font_02_sfnt_off00013d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1