Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf327b6237eda13d…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 07:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13503a68bcf1c79b4db7171bd1785c50 SHA-1: f81f02034617598d51d50c8182fe50008728dae9 SHA-256: bf327b6237eda13d60611d03152ffdca6f61da31fd22634a51ad80e2a3dd7a49
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and a raw IP address, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms, such as the one pointing to 'infrive.ru', further supports the attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=how+to+convert+pdf+files+to+jpeg PDF link annotation
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607da14eec9d8---bajafetixajexiv.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f169648aad960e3071d7c3c85a7a078f/53906437944.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/zetuwunodapaka.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/bd5c6c9f5e16d288faefebf37d3892df/42512813706.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/pimukiwomazajitalobanaf.pdfPDF link annotation
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f1a9d2aa36c5fb07f63787a29d24d99b/zegikipabezatubipamanonig.pdfIn PDF document text
    • http://ducnhua.com/upload/files/34332543398.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/vasojefomunof.pdfIn PDF document text
    • https://megashina24.ru/files/files/42305249687.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/acdb223a161d09bc2912c8f8c9441afc/jisasojogigep.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f50dd45f---25134203107.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/piresisufapakixadediwo.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2e05c2fc7---nimewakagob.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/wekon.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecdddb4ab4---78466391270.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/9457289353.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/0e7p641t2omb4kihga23k3ns63/58794043582.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/92389822167.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bb61e548de6---legonawibeleku.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5fd1c500a756f51c49a721c226d31c60/65351928729.pdfIn PDF document text
    • https://teamcode.net/upload/files/60372309023.pdfIn PDF document text
    • http://ping-property.com/user_img/files/11803770683.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061112131969.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/27535759454.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_off0000c63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63B 10904 bytes
SHA-256: 64456375f0f72ec482c214a8b27c1bca765b4829b8b588a33d28908d9ffa18aa
font_01_sfnt_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 16148 bytes
SHA-256: 9e9250ccd03eaa27c0c4f58e7734513bb7b93be375ed1a069ba995c8e12d2cd4
font_02_sfnt_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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