Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4afaf370d0ff1d0…

MALICIOUS

PDF

88.7 KB Created: 2021-07-21 10:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e10ed5fee813558195ff1c13fb7ba5f2 SHA-1: 2a57db455067f31f53454347474356e38dc706df SHA-256: a4afaf370d0ff1d0a859af55f68e3fe1aa4c8a3667a0d41219085092f5a33fbe
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm and embedded URLs, with one heuristic specifically identifying it as a callback phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan. Although no scripts were extracted, the document's structure and URL patterns suggest it is designed to trick users into initiating contact, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nesthomes.in/userfiles/file/82043325326.pdf In PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d44f19ca0b8c3a197399fea1f98c45a1/1614919709.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b54b71da0c668ebca929d713dc8630df/61325016949.pdfIn PDF document text
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/sudawevenudesud.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/luxax.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/51201736266.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16093061ead78b---remukibobifewuwojoladev.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ecf901809e6204bc067842b99fd79ba4/roxevobakofezavotivaxa.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/89321981807.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/xubufulowixikas.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/93044960012.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/4658139316.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/pfe7n5383023d8ntf9e7pvpgs8/90942624469.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/jovuzekunowuj.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/wazubepilumekedavotobobeg.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/fijimaveregujolu.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8f808a1050eeeaf1b889b00bbc52a412/fejafawojiv.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6519523c41---83358632602.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/vchj39nv7v213hcromgctg91l1/moresizumetub.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/kqldell968fd0qcui55tj9eer4/64826575782.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ac9e7a6fec6d507edc2011a02a731bd5/4960385745.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/26069765512.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608628b7984a4---lakorofadikovadutomu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad16f170d5---vofulo.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/nosiwojad.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2227d882cb---zuzekutokoraneruf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=my+employer+overpaid+me+and+wants+it+backPDF 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_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 11164 bytes
SHA-256: 273119fbe8c11209d11f69b9e28c744fd9a91a9944f846fac591a3cf70400c40
font_01_sfnt_off0001128e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA0 16440 bytes
SHA-256: c53a72b174d390cf3c940741f803075f89a5224617e5f5e81cba6f09afd62a9a

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