Malicious PDF — malware analysis report

Static analysis result for SHA-256 814dffeabbe21904…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 08:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee64db53bf24736046a2727cf11121ac SHA-1: fe17dfc4bab7cb87929c600ae9a776c7bcafb11f SHA-256: 814dffeabbe21904f78732ba19fb89cb493ec934966d8a369de84c4fe2116d18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=meio+ambiente+resumo+pdf PDF link annotation
    • http://szkolaprywatnaleszno.pl/userfiles/file/nezodevojesebosaz.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/271bc46d130791783c1f93183dbee20a/bivusoxefulevobogabaz.pdfIn PDF document text
    • http://atomleasing.ru/media/File/18497856150.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/81300594426.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/58802909309.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/41153009591.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/kiwulotosefufole.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/91650099234.pdfIn PDF document text
    • http://heizler.hu/files/file/gibonuwixadevutiwami.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/1ef5350ea8b7ac71ba7fbcc4ed0c9a52/41897885006.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/23933670167.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/niweleladab.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b4980847b---82300421923.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///pelatosikilobi.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/rutiwe.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/fukefusepagaderotokifagis.pdfIn PDF document text
    • https://koratspring.com/upload/file/topesaguxupew.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076d3342e18d---juribu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/tlb7asjirqt5iu73gbb5jjca9e/82658865148.pdfIn PDF document text
    • http://lactopad.com/uploads/files/xobosodixunevupovob.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/lr1acvqs517isvtlattmc2abcu/86322755910.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/77010064449.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3b9192374aa23ad62fe32897645c6b3d/36313929900.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/16313858768.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_off0000d396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD396 10844 bytes
SHA-256: c8c4340cb68038da54a328f870850933c5973e698f8a12341587d51ce6d30349
font_01_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 18804 bytes
SHA-256: ecacdfee4def053576a5a5cf9b5941bfafc2e01328b95d443cde25656b5912f9
font_02_sfnt_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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