Malicious PDF — malware analysis report

Static analysis result for SHA-256 952ab14dad05a6cf…

MALICIOUS

PDF

82.7 KB Created: 2021-08-17 08:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c308c86464daa6564bc6f2e485728314 SHA-1: 0d94421d38e7a23673069fc858bece1cc8133ce0 SHA-256: 952ab14dad05a6cf7324abe1e2b152640a1d192608769a9698ec8499f2cbc13c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's primary purpose is to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://hagelkonzept.de/userfiles/file/23681809978.pdf In PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/22528739047.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/mesososex.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/dulamijezopekek.pdfIn PDF document text
    • https://isleo.com/i_photos/file/55094025727.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e61c1ca8b3b---13445661006.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/kevaretifotekujena.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1336b7ed7---61766989217.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/14523700190.pdfIn PDF document text
    • https://cecprint.com/images/file/16508226311.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/70296627370.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/19816513103.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fad1561208---kojigakogamunipa.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607517a96952a---10192800624.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/65021571384.pdfIn PDF document text
    • http://snsi.jp/image/news_file/20898048151.pdfIn PDF document text
    • http://mamam.by/upload/File/file/zuferuluxawulewizezet.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/80370731277.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/53970914719.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/efc9c20cdf2146c3c6d19f0502ff9a8f/nuwadalokizazul.pdfIn PDF document text
    • http://gsoutreach.net/clients/e/ea/ea4f28bd0b090870cbed8536b6d1d406/File/51370299082.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/v3qrscqaeskbidle421kriaddq/21394365216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=easy+recovery+essentials+windows+10+iso+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_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 10784 bytes
SHA-256: 9144613a8c09b0a61892468d542440a8460aa5079cb96f724c1636c359280d23
font_02_sfnt_off00011314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11314 16200 bytes
SHA-256: 0930db4533fe45fa7a525d9688b40214f69f059ad1feefd38a15cc0e92ea0b62

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