Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d2886647b785f4…

MALICIOUS

PDF

88.9 KB Created: 2021-08-14 20:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 75eea6eb7414c6059b89692a51a7a57d SHA-1: f94f8aff4ef3f7b5bad8a99a801bbe2b94759d24 SHA-256: 35d2886647b785f45202836fce7e954245a408771399a894279d63dfba6f6896
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal that the document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f6b7aa0c9---bijenu.pdf In PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/xexemijeg.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/21726521099.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7d175j7sbbetbrl456t9sitmp7/vitarasupewa.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/a2e55ac768fc558380f0c7af2748d1e6/45358378815.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f978a2d1b1---zuvezevexalazij.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6aa3f0d5c1---18259561045.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/34328903558.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab686a81b0---57393337743.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/22682815087.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/similelaxasikonujalivu.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/tilav.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/37770848503.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c6392841f90---66728196344.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/dudipi.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/15819880006.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/75137439718ab3598c6244902726b1fa/xakimiligij.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/zavamosejepukufiri.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f93dce3203---80732263022.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/40852729013.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/slo15l1bkrvl440ul06iv981e3/50182257258.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2c2ce18aaf3cdad391ae61805e3791dd/sisoz.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/wulatovasagowiseduvesej.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/vatepaxadugofuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+surat+yasin+dan+terjemahanPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 16324 bytes
SHA-256: f6fa311c43a2792f175e447f1c288b8b390caab96785aa7e4d5bae317649bc0e
font_01_sfnt_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 10944 bytes
SHA-256: b554a0c689032d2f5fdcd733b56188b65a93453d44e4ef9edb5de34f8bf04a1f
font_02_sfnt_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12820 17156 bytes
SHA-256: 94b81264e8f5f6ca4c7e952d5b58aef335c8e01bc0bced09ca06490f01a7a946