Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7d2160c9c7430d…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 03:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a81a27044932aae6b7428d414e1603a SHA-1: ca29a40d8400a586de7f9f289fd98c3e24ad6dc0 SHA-256: cd7d2160c9c7430dcdee92414afe3e5b516023fdc102287328e76b5445cf6330
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to other PDF files, many hosted on domains that appear to be compromised or disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the intent is to lure users to these external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rozeperasedesatokomanev.pdf In PDF document text
    • https://tanthuantelecom.com/upload/fck/file/96575015235.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/78911986724.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/bipudizixabuzu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/904642c55c54d2898709d66770c27a59/7625746589.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/99547880073.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c1392064e---buraximejoluw.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/fugotazajegexixawi.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/lawobudekoganasifasuka.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/33865708114.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/91035055262.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/82912212216.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/31022583114.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607270c509bc7---ditosimiba.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/23218597807.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/18184987278.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/2412683723.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ce7a25249790a2175bbbb6e36d413b7f/nilebogelinaxavusexe.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/16575288092.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/8220331812.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096858739c4f---70641677848.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/52310131110.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/meradiremujujutifan.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/93185583018.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/308e448944083781fac9e4a9b2f83da1/90619920199.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/ritatubesino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=live+cricket+streaming+for+android+mobilePDF 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_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001044c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044C 11076 bytes
SHA-256: 66bd2362a0c1ea5a6dd92258af7297c9ade356c6155a7952ac20f44af47d0b86
font_02_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 17956 bytes
SHA-256: 689e2e143d54c87b2a77b1906a21c817e5b820d2372b72df3e10b0f4e12d9414