Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7d336f5404f273…

MALICIOUS

PDF

90.9 KB Created: 2021-06-29 22:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9b73c87f84f544b16af8e9f4ced801b3 SHA-1: d1047e05c247b29412637dd3f5797cdea49a1586 SHA-256: dc7d336f5404f2738d93d8ba88774b50f5ad884f8c7d845043997c9d70151e81
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple links to WordPress upload storage suggests an attempt to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://infunplastic.com/d/files/vureropenateron.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b82d7e5627c---gusonexu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160925210b2a3c---25808794656.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c696e63740a---bumuwadinej.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8563e2b31ced498e57580296658256ca/dumemajun.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2i8vio93t89aa3e40jo2q7q3of/57716217088.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/91535694011.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/i6g59sfvv94qer0l43mcq9ac9v/94564612745.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3ff632ff331f6444e335f17ce2615d03/nolagotomagilixonumejokis.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/38017256253.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/36631513436.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/66441902320.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/91b05ce1030937d40ac51ddd96563a70/digafizasefugidasamibepet.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/butazafarotazebuvusirug.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/somubupetivitenu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e9d628265---durodedenulewutilu.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1623632696.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/bulozuzosozafopojatoj.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc1998bc9d---42930026017.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/rewaboxemilidot.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094b0f2a144b---54497319450.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/porunajim.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/sizonuferowuburidak.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/48855887413.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/5b59b50b109a6d56a92178999f3099f3/34961865126.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/patufixifezekifuwitena.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160707ae7792f6---39516001104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=online+pharmacy+with+doctor+consultationPDF 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_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001178b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178B 17128 bytes
SHA-256: 58999e8b1eb1ad6c1b485662be9ea064d3e5443cf07dcb3861184e495bcd475b
font_02_sfnt_off000143d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D1 11104 bytes
SHA-256: 196c6bb7083f05934a10861cb6729439765ff39430259347506267fc304d079b