Malicious PDF — malware analysis report

Static analysis result for SHA-256 329436518885cafa…

MALICIOUS

PDF

74.8 KB Created: 2021-09-10 22:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0f80b9b25557ec4f0b542f13df75f18b SHA-1: 03c429b489058baf98108d7f68b508b1bc398cdf SHA-256: 329436518885cafac07fd80ad4aae8b0ddcd288a35930b62e89eca9578ab446e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms points towards a tactic of luring users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://riph.pl/userfiles/file/7317288521.pdf In PDF document text
    • http://cuboni.com/uploadfile/hong202109041553207978.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/72161203543.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/bidaruwirotokukowibapusa.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109100615236604.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/25652002053.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/vudepemigizinimafubime.pdfIn PDF document text
    • http://retrofotr.cz/files/file/jitavisoragijedob.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/44088349028.pdfIn PDF document text
    • http://ahchala.com/img/file/suzoriliworutaxiwu.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/3465883165.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/19075302362.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/52424073227.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/bakobarezotariru.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/suvuzorifez.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/najabimegipo.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/tisirexezo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/892963eb12a4f90de40bbf40b1c71222/90724308021.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/beres.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/feninavudizuruko.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55a604f4e---5104299476.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/labagigepevinuxobokas.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/jajivegexesukibinuru.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/47790195956.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nadoxukuxila.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1f7e463fe---todurelevev.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/dufowoximazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=iphone+chrome+browser+castPDF 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_off0000c21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 10680 bytes
SHA-256: 9b6a16dbd8f17167afb36d7917ef67065301cc0a72464aeb6f0ecd25f9f1a669
font_02_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 16916 bytes
SHA-256: 867a8dc6fd2c05b650e2c4d284b0286d2fe2f3aeb473ae24db37782e86e811c6