Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead7fa8c8a9a46f9…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 19:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c3c9cbd351189cbed7cfa8285d5de9f SHA-1: 572aa7d64f667a6ce1cfe5b6406ced1241083666 SHA-256: ead7fa8c8a9a46f9b2df683bdd1a3d5a2b3797faab3af78021fc80e578ceebbd
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and numerous URLs suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6afd44ed5---41046496326.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a39c541afd13428911a54525f18adfb9/57656561228.pdfIn PDF document text
    • https://buyafranchise.org/files/files/55791741462.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160865ea1e7c49---sulivaragutebefuruniz.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee195e0246---zojazogawobo.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kedapolidenona.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/bibawuvitikopiritila.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124f376d0051---3755406271.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/21890697738.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/wanatazekumamivifetejelex.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/vosalenawizunudowofudifin.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/34794480930.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b24f065092a---26468153641.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/bikuxejajenutot.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a8fad1c5d1aab2b5868235b50fad21b8/rujakewudifabekixur.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/f5dcf6dc56a69b40edd174884211cff3/powilesujibe.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/29368015358.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160da79ae2ea10---degobikolidax.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/makufusutemobubijalule.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/rojem.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/xedobexufufidajasudew.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/jigamiva.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87f0a3477---51488919054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=democratic+developmental+state+in+ethiopia+pdfPDF 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_off0000e13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 10952 bytes
SHA-256: 1f37fcd0329c50cd98ac9ab81af86b94e39d1e60ebca0eb6369f6550dd1df1ae
font_01_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11281 18640 bytes
SHA-256: 4df1d445559be79d19f8f2c881608039635d5e654e7e09d97a9e92401419a035

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