Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db41a5912370707…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 17:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39cc627b95149de3307c4b39c03aa2bd SHA-1: ca63864ea324f0c4c4e8060f334159c133577fce SHA-256: 1db41a591237070708994b5d5837db572bba5d0d5fedf8daf6c0567b21eb5276
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to mislead users. The presence of these links suggests an attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fusheng-vietnam.vn/admin/webroot/upload/image/files/28037578124.pdf In PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa531ba960---zurowuzu.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29264614073.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca4742197d9fc24a908307007e898ee2/gevovixunefoda.pdfIn PDF document text
    • http://atomleasing.ru/media/File/65726596513.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607074d47615e---nikuvixesodudolamig.pdfIn PDF document text
    • https://aromamarketing.md/img/files/78374193190.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/2703257302.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/g735g0mdocosp5f3sk8mi1ha87/37134019513.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/3065622491.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210528_14BD3FC749EBCEAE.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b683d0015479dca7e82cc491d4e1c87a/tixudexedebepezokadujusa.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/bewobibapusubejuxaj.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/30132050249.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/bekubamo.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/dugurugejuzad.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8248a4f2---24273407799.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3738cdb207---lixasikidumarej.pdfIn PDF document text
    • http://cy2hand.com/userfiles/risit.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/92026b6603179cd3748c34a277d6abf8/51939838067.pdfIn PDF document text
    • https://senhewood.com/d/files/77370923617.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/sf801g432tt2l2og8malkr7q64/51613782920.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/c31ef5ac0a431c8de34b5b228024e38d/84059471813.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/48834644173.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/xupuvoturapipejobebijodon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=kenmore+air+conditioner+user+manualPDF link annotation
    • 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_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 17736 bytes
SHA-256: d8206de278a95dc368de9dd75e8dc4024da7ecf3d453150ef9763ad8297e5551
font_01_sfnt_off00011fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13805 10624 bytes
SHA-256: 4a565d004a0795e12da4c7abedbc68cab383d4f05ab92ad4bb4cb37b9a9ac17e