Malicious PDF — malware analysis report

Static analysis result for SHA-256 2735c155fcd212bf…

MALICIOUS

PDF

92.1 KB Created: 2021-09-20 18:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09caf78be1f5367e5f1e72442d46650d SHA-1: 61187b06bed73dc2ad8ba72251a2216505b146df SHA-256: 2735c155fcd212bf95236be584e782e7401932be57b5c46636b0413d051b1d5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the detection suggest it may leverage embedded JavaScript or exploit vulnerabilities to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://holdemigny.fr/ckfinder/userfiles/files/72748650675.pdf
    • https://arerp.kr/data/file///jijelidu.pdf
    • http://dgelc.com/userfiles/file/20210903030604.pdf
    • http://ghinelliarchitettura.it/userfiles/files/pebefowideka.pdf
    • https://equinox-e.com/upload/UserFiles/file/64994225544.pdf
    • http://michalpavlicek.com/uploaded/file/padebejozomobuwukezaje.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/63049452089.pdf
    • http://bamila.vn/luutru/files/15836186210.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/48665893364.pdf
    • http://cutyoursupport.com/userfiles/file/25192967057.pdf
    • http://techscreening.com/userfiles/files/jomokisuvu.pdf
    • http://homesunshinepharma.com/upload/files/12698389554.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4e0641ed---67809259635.pdf
    • https://nazragame.com/calisma2/files/uploads/15833411845.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/92ec5cf70871a45afdd9a90a5f5babcc/91684760457.pdf
    • http://ticketsperiodico.com/galeria/files/85966687693.pdf
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1631082325/files/pasenofosiwepo.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ea42ae5f68f637b9a0d1df48d261f745/15135637085.pdf
    • https://leo.tw/upload/ckeditor/files/26195988112.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a5ea4dde---8006236762.pdf
    • http://vizugy.hu/uploads/files/7623412236.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/79761330178.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/eb7f8aadac3648d261ab40e0f125fe64/89135174574.pdf
    • http://jtour.vn/userfiles/file/47125547287.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=go+download+movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105e1.bin
9a29c4f071a4975e15f2aca5875f38cccce94b4800c0cc7cef472214ff7905e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 17440 bytes
font_01_sfnt_off0001330d.bin
1311ca26bb4dd4bb0ca5dab25fcc75867a2e14d67ef2b882cd26dae8b1aaf6a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1330D 10404 bytes
font_02_sfnt_off00014aa6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA6 16792 bytes