Malicious PDF — malware analysis report

Static analysis result for SHA-256 276bacbabd62c580…

MALICIOUS

PDF

88.9 KB Created: 2021-06-25 22:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ffc8dfb3175c72718709248c94df4b7c SHA-1: 3fcb5972058fcf7c4dbedda7044bd99af0c6e714 SHA-256: 276bacbabd62c5804f73fb9c43160bfd58eb1564953fa7db2a8c0565f019fe07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and link farms indicates a strong intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://laborke.ru/uplcv?utm_term=how+to+give+interview+for+freshers PDF link annotation
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3dbba0f84---fitusujilipexisavegawu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f33146adc---27380941428.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/af9e1ea60f6eea892b9e57be693a81b5/95164314724.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/201e8d176970fd0a607520af231a23f2/subusovofobugu.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/d4b9e6befc77f5eaa5e6bd013b064088/xemutomo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13d7e19a1d---518981410.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789bda6657d---42241112020.pdfIn PDF document text
    • https://primer-spb.ru/files/files/batin.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/tusotiwuxebinano.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abeae88b247---tilewiposugadijuvowoketaf.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/a2nuo30o4sbn46kk135b5445fo/63800915519.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/zowuvo.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/87605570595.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/mulajawawo.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbef0c4b74---tipabaviwumo.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210612030809.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609879846ddae---34443103354.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/kagodeloluz.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160818ff24bb4c---41783075783.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23c9e329e---rafikutozolefizafejapofas.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/6319152219.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/44718479936.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa0d50e1d---37914470173.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_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 10428 bytes
SHA-256: f82edeb8a85fb0432ada259737454612eab7a8c99acedaa566aa7c95ed771308
font_01_sfnt_off00011134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 17360 bytes
SHA-256: 469904f11e6b2501d2b5207181694eef90a3029e7bce0f7e480d433325180734
font_02_sfnt_off00013e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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