Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3959eeef05dbfd…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 07:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11a4e1dd36385482b633f3a65a5bbce4 SHA-1: 196c62788e1fb992280364ef48dd5882786685c6 SHA-256: be3959eeef05dbfd78f632c17135c52cfefd5357a5c3eb5200671a49ece06eae
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate the PDF is likely used as a lure to direct users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=android+taskbar+symbols PDF link annotation
    • https://szabobuszrendeles.hu/files/files/96272086685.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/rabodexojitipefikifuguwo.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/sazan.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e4cbc311---83239863882.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050453521662.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/40927947559.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/devilaka.pdfIn PDF document text
    • http://vitrine-prof.com/files/66422290183.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/mofubo.pdfIn PDF document text
    • http://tochuchoinghi.org/files/dekonezofado.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f3b56b23bb587a6e6b7e6c69ade12f98/11452846389.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/fidifumesowido.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/58728160.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/68542694878.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/saguwapavotabivak.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/fepadaponodeju.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/s1h8piiq524ti9qhk2412jie55/78317705775.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/22651780850.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613964b2c0d29---wajakiliwigufapixum.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/vusolozemijukekofaxos.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6765f4d344efd7b143e60e7583f52ebd/16249001689.pdfIn PDF document text
    • https://aneri12.eu/res/file/ronowe.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/jugidavatoxajazipopobub.pdfIn PDF document text
    • 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_off0000d9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 10604 bytes
SHA-256: 362043599b1c5d0e665396a312f8b809e928885ad5e6536abd2ce6a0481a27ad
font_01_sfnt_off0000f1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 18112 bytes
SHA-256: 1c34aa56acec1bfa6caec41cad452b87ee33e03ad7d67cf6f9de5e16c8d59e02
font_02_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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