Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf352d21ae014d5e…

MALICIOUS

PDF

87.2 KB Created: 2021-06-28 09:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ac03fc3983b26839c1b5934fd3d8b17 SHA-1: aa11ad90a5da1f80aef262f64cbb64cb13872bfc SHA-256: bf352d21ae014d5eca600f8d5ec3843d5bbfd34c3a4288701174e8460855ece6
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. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of multiple external URIs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://deborahkay.com/ckfinder/userfiles/files/topadawemupopox.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/81254003802.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505203452150197.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/r5a6ihoiqmi2apshj9fsehqb04/1259977709.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebf9d852f2---dofabikimakazidozowazoze.pdf
    • http://rajskiewakacje.pl/userfiles/file/25995161352.pdf
    • http://kxnjl.com/userfiles/files/82209430167.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b746c3f084---nisosukete.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1c2bc31331640765d32c0432ff2983c3/30806228226.pdf
    • https://africanresearchcenter.com/userfiles/file/sotamula.pdf
    • http://stillwaterponies83.com/clients/74660/File/wurur.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ra1geebdq8u00ocfbbsrhq1foj/piziz.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895b8a96907---19381918868.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210513235931.pdf
    • http://lso-msm.fr/userfiles/file/xinipamewafobonagorewu.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609645d76fc0a---48255934790.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/hg384t43gprov8i6mdra70jc76/6256653308.pdf
    • http://s-privod.ru/userfiles/file/xabiponurajagofojov.pdf
    • https://dakhoathienhoa.net/images/files/43407959501.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/036bbc3184080c702badc713fa1e3d10/71550354796.pdf
    • https://binarbaid.com/public_html/userfiles/file/tewizisezimotikeduwotil.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa35965822b---vepupubaparev.pdf
    • https://ruiguoex.com/upfile/files/2021/06/18/didobabove.pdf
    • https://oteaexpert.fr/cite_imgs/file/98531517899.pdf
    • https://asset-books.com/userfiles/file/wibiduzumujonuxoxaper.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=he+did+not+give+us+a+spirit+of+fear+kjv
    • 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_off0000f151.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 16792 bytes
font_01_sfnt_off00010963.bin
e68ad1d6f690bf703ed66fdc3776c9b96efaa725be3d9fbd5c57b9b05da9f1a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 17008 bytes
font_02_sfnt_off000135c6.bin
d44e65d248bd5a549c2f93e4314eaa22547bab15f991d306d8dd006fabcf5cda
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C6 11004 bytes