Malicious PDF — malware analysis report

Static analysis result for SHA-256 a856e1c7bd561461…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 20:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e01f4b1d80e2f1a17389893fe129918 SHA-1: 0f66208c5c889d9b20194635b6a96ca36d5a7c6e SHA-256: a856e1c7bd561461876c823ad39061afe39e5322e45522f4a1affae47371ec79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous URLs pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://baxsporthorses.com/userfiles/file/68313649578.pdf In PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/47048109711.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5be54f63---233949416.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/79623471518.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62993e45f3---38251231368.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d8277658766205157908869ed58e0f55/pejevafesudij.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/bawosona.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/67186723639.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160869d6883bcb---gotakulom.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/xoludifesipol.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/7018570817.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b2a8c7a1e55cf17d20c261dfc5acc08f/retogedulesowebife.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/23185550775.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/reribedagidokoreruti.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/27e792aa07d95bbc115cf6b6c2d2ec0f/49815509243.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4184399d4---xumekuzebigemutakup.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/vupumajilopumowumuxos.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/71809364382.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4c454ad4b---sovegowobefezinawubin.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/qce5k56m5u4aipqpshlbvgtk67/86947769999.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c3bb255c67425ae57b1038f657db6cc0/poretepotedefawavewini.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bced6ee90d9---79446267171.pdfIn PDF document text
    • http://all-premium.com/user_file/files/54437868603.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/64401062773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=entertainer+piano+score+pdfPDF 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_off0000d09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09C 10548 bytes
SHA-256: 2b32b1244dc3bf03649f6267fe73c3160cd8e8570dd25ad0ac98551820cf5764
font_01_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 18124 bytes
SHA-256: 3feba6843c1e4d6bcd41a407968f03940e87bf4b86fb79792901d7692432a9ef

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