Malicious PDF — malware analysis report

Static analysis result for SHA-256 950f9622bce6973b…

MALICIOUS

PDF

102.7 KB Created: 2021-09-02 04:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4110adc5afb67d086502b360e2960870 SHA-1: 5faf12c113b841bccabb4700229bd0ddbafbdd4f SHA-256: 950f9622bce6973b26a6ad045bab3f573cc1349db12db614bcf9d8f836900143
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggest it may exploit PDF vulnerabilities or serve as a dropper for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2ivji5kaodg2a3vqu6t7kg5vro/77548135840.pdf In PDF document text
    • https://nic-irq.com/userfiles/files/mobarojojogapojusetux.pdfIn PDF document text
    • https://nevisnews.com/userfiles/nekaraweke.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a88b4a371---1310247631.pdfIn PDF document text
    • http://acril.ru/ufiles/files/fowaf.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/levefabagevivemener.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/55671323047.pdfIn PDF document text
    • https://tcremich.lu/files/files/pasunogepisa.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/rawupizo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/u2slmqaavmnq4h88k39dt0ct7b/gajalanileketibo.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/92465411057.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611193bb15314---sebikufo.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/vilezeza.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/81d8540dfe95ad246ad0ca6cdf2e1d66/96751071395.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/eabaa5fd678f0102733d45bec4ee382c/reviguxigokogudepo.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/67313177580.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210505063046.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab0a86263b---sikufiluzejoxibulu.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/82565395373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=general+knowledge+trivia+and+answersPDF 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_off00012bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000143ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EE 10704 bytes
SHA-256: 0995c9f2f8dfa82c99e4acb394d83978bfd496e32b2e4ecddca9ae3af5d743a8
font_02_sfnt_off00015c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7E 18628 bytes
SHA-256: b62b3f3916992288247c838ea395103ae373116d0910e25a156f0d4ab71838ee