Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f0e4cf56388187…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 19:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff0c2fb18baecd1e1439fa41ddb571b8 SHA-1: cc22ff6b7b416ea104343a6d7daae63e2219e6f5 SHA-256: 23f0e4cf56388187033374e39ce83669a61192e8da6d91fc89b960ee6191c38c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing attacks. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://queure.ru/uplcv?utm_term=breaking+bad+season+1+123 PDF link annotation
    • http://pmrs.ps/userfiles/file/15393540305.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130db69da450---93502845282.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/92622590240.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6f03ea581---10294464144.pdfIn PDF document text
    • http://moristas.com/userfiles/files/10581439873.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/60718876598.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210904124914_w2xfub.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/dopez.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/10506084215.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/tuvavowaserifirasokoda.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/63542732039.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8dddd0f54aeb6dcaa73ab53328edd941/gelumugudix.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nubuluvawakumimaninera.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/zofikeborafekate.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4ad5dd58a---31546881747.pdfIn PDF document text
    • https://onlinendttraining.net/files/xutobewize.pdfIn PDF document text
    • http://schubert-hh.de/image/file/dazub.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/jusuj.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/8509903538.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/56f94a59dadd10e70ce0fe3b1f5cec57/dabevulidopafipisogim.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/87245536605.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316bc9818ba---bibibeveweveb.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_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 10908 bytes
SHA-256: 29ac3ae29b40ad25436ea23222b751e24a4021aebddf6c5f280f2c506132230f
font_01_sfnt_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 17128 bytes
SHA-256: 8bf49ebcf661495a23ade843c79a5f4fa9fb12af53007e25be982e823a91461c
font_02_sfnt_off00013108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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