Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe17d514ac53260b…

MALICIOUS

PDF

67.4 KB Created: 2021-09-09 10:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc45f280076246b977fa60bcf11b36f0 SHA-1: 0a1b379a970634d24441da4800c0418d6f4fe7fb SHA-256: fe17d514ac53260b90fcd8f2f963ed9d8235bfc9bdf07226a4bd3911215a87fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://quaint-house.com/images/blog/file/bivivabigifixe.pdf In PDF document text
    • http://iberryhomemade.com/userfiles/files/vadizisiwiwe.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/61731816853.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613969aebd0cd---26045394371.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/kugetimerazoledubos.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/41325942667fff5f87d0f876dac97cf6/gomosemabojiruvadose.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/fejijofogetonafinimagu.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/6989682106.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/76619438426.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/kojilimifegato.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/66204450996.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/xikelowixobivisuke.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/29264504473.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/goduwezedazagibisubax.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/38499199314.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613548ea725e6---13460973389.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/lapip.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367e5f26aa7---26251936893.pdfIn PDF document text
    • https://ms02bet.com/contents/files/10328155824.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ac11be0e3386a59e4952155460495b2c/49155081393.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/vojaxuvukizobita.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/midoluwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=inshot+free+download+for+androidPDF 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_off0000ad7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7E 14108 bytes
SHA-256: a3a93b2a27f1fdd1bb7c4f01e3de3bf89fb17d4ab96103df848f228153dfd30d
font_01_sfnt_off0000d08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 10488 bytes
SHA-256: 7d9a46049e4373e78f0a5645e36caee2589235212c22d82906a8fa3de5883ff6