Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5d171b1657c87f…

MALICIOUS

PDF

89.1 KB Created: 2021-08-11 15:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1250df4b7bc1a325fbba61531f3b7db2 SHA-1: c51b92e5f7ae37bdef5fde3b732fbd7f0ec140a9 SHA-256: ad5d171b1657c87f05cb08c644b0d9cb4331cb6ecb8c03e0b30c4e9d70eeba42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classification and ClamAV, indicating it likely contains malicious content. It functions as a link farm, directing users to multiple unknown PDF files hosted on various domains, including a compromised WordPress upload directory. The presence of numerous external URIs and the structure suggest an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e50f058e8ac---89350981366.pdf In PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/61748353165.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/69327163019.pdfIn PDF document text
    • http://afslab.asia/upload/files/39674295842.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bfaeef874b397d3eb1b0027cf8502bb7/biwakumenub.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7mpbcliqffgd9ikf98j4sn3b94/fijituguzimigilisugu.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/bezezef.pdfIn PDF document text
    • http://2440027.ru/upload/file/refajo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2c115be477ea4a82fcee1083bf6c6259/rixunuzavetarorosire.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/49829395680.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/29cdeed3044bcb63d993de75ca64a2ce/novufejivopivekeba.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/tixelubasojawoda.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/pasaw.pdfIn PDF document text
    • http://myredm.ru/uploads/file/59234787354.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072aedc87c61---kutovefuvimabogagelim.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/pidutojaluxusija.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/dh1193dcef8usbtvio5m488elc/70762266448.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/bidanutepedupavefafod.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/vimowudipun.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e814b3f4b4---kupaseku.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd0c5d475---9936843276.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/kizimasotudugub.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa66412cd---33996183412.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93bc09ed6c---luruwinamutugasojovawuleg.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/jolugejajigaxozofiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+do+you+calculate+npv+with+cost+of+capitalPDF 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_off0000f7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 16964 bytes
SHA-256: b2cbed05fb733a0ba6bfd62df55c098a25a7545065fc0ef2fd978045c6097f88
font_02_sfnt_off00013baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAA 10976 bytes
SHA-256: 471766e72b4586a171dcb046ee006f26d1f3f50429e6bf49c9cda4561081f28d

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