Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc113c535d85715…

MALICIOUS

PDF

89.1 KB Created: 2021-09-02 05:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe137a26048c03cb3e24d5595b0ffa44 SHA-1: 1fd9253492fe355781f250010dd845449136bc4f SHA-256: 8cc113c535d85715baf6b482a06d97e1df52508e06369a26c3ef6f1557fed809
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://infrive.ru/uplcv?utm_term=insidious+in+a+sentence PDF link annotation
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/b5p6qg6mbbegpl1eqhot36j646/lavonakirelo.pdfIn PDF document text
    • http://usagimatur.com/files/others/zikoluxuwiwum.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ad6g62f1s7b9lkfelrs4jq1gn3/2557058603.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/galevujurumibukita.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab15924d78---fagif.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/zezelozemumimurulijim.pdfIn PDF document text
    • https://agermag.ro/mm/file/87683929980.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a3de0c0964728f35e5b25a0fd8f098ff/12594215317.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c853df4682c---zomeb.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/29296758267.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/89519635629.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/83938931353.pdfIn PDF document text
    • https://kham.vn/userfiles/file/rubaxoripupulexilewotu.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/tepov.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061405345273499.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/330869556.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6e584c5e---59582077231.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/fasedejeka.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/vozojawafosopulolam.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/gowug.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/sakvenuji11ur23s05msoei40q/65112418945.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/65000165625.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/selime.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ac5144e40ac660082b38dacd5d2b7f76/94448301614.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_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 17824 bytes
SHA-256: 1d66e17350d7d6999e673761f30e6d72d5f06111ac6b0851f60b77e06b7533a5
font_01_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 10268 bytes
SHA-256: 1d88544528a62761a3803f434d409d6c8a127e09ff04f3b6b01ab1b1b250b5ba
font_02_sfnt_off00013e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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