Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fff8da6503b451…

MALICIOUS

PDF

78.5 KB Created: 2021-09-03 15:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1add08c9744e5478f749c887d9fb930a SHA-1: 9bfef038336a013938fc418467690135c2a1f465 SHA-256: 51fff8da6503b45150205a8388917c91401def4348f28dfa0853f1ece51d4fd3
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to potentially compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content or phishing sites. The presence of a 'download' button lure further supports a phishing or scam-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://montagnobozzone.it/userfiles/files/61990620018.pdf In PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afda3f714f7---62801339390.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/ff27204f273b75ce11be29a93c133e23/xudufo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d193a7598b---vovemowumugukewoku.pdfIn PDF document text
    • https://12shio1.com/contents/files/71939200833.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/89924502870.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25d83e4681---kiwabifitaxe.pdfIn PDF document text
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/8984757511.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021080914013628.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160940ad74cc93---gavaworumuresaki.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/zutebozojiduloz.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160875f77cbf77---2094041219.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/bujuletipobefuroroto.pdfIn PDF document text
    • http://npas.ru/pic/file/wiwedifojibide.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/tadadijewuvapirejosepavig.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bee903c277c---88764402771.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/pefekulag.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/kbe7rfs5u6o01r9if1q3rju5vj/zutezi.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/xupafibuzo.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609b203ad2c2e---zononi.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/trfujqacmcrr20r539qo6629h3/ninomaxazor.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/68125053837.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/2777851733.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ctlcftk7nrrlngccsgplkn7h0f/16373972036.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/5643199387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+to+document+converter+downloadPDF 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_off0000ced5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 17448 bytes
SHA-256: 58b94d25f1da9383730d50246ea35ef98e0a1a4e48c9a47c4de8922c7b95d5da
font_02_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 10628 bytes
SHA-256: 7172f06dae3a239cb3ab762699bc0ae51d38393efe78009d3ab88ace554b349b