Malicious PDF — malware analysis report

Static analysis result for SHA-256 f805fd3f7e132d93…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 04:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19ac52cbc5711d66e834d8b66f2a827f SHA-1: 291d463e0fdd5065a90979d27b6d3c9f8b73b75f SHA-256: f805fd3f7e132d93ca788572e87fde34658fa39560865e19b7a35ea150b34192
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number intended to trick the user into calling for support or to resolve a billing issue. The presence of numerous links to compromised CMS upload storage further supports a phishing or scam-related attack pattern. No scripts were extracted, but the overall structure and heuristic firings point to a malicious phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9a76ce7827b9756b8a15d9e09173d760/3012818073.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfae59a770---17113181305.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ae2b1b11df1c7365ca7b1b32c889673b/89789816461.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae749901590---64002653368.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210822_1C28B540C6284B6C.pdfIn PDF document text
    • http://soflcops.com/clients/83267/File/lolaxajagemediza.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/sawutas.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/e45705be17eaf46768dbf2825fcb7449/navunelugi.pdfIn PDF document text
    • https://mollis.rs//files/65720818976.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d7555d1c62ab9e0ddb98038f7974be49/zowafudon.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f43902cd2d---18653670915.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073726f6622e---relodulagure.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/43695164183.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/61223997253.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/17864697896.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/45199415992.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/naduniwuze.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a175a19f5247df3c268b464e8d8baf97/jizobasata.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa88583f5d3c1e665ac33416a1b04843/56600299125.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/18824902205.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/xinepewusubo.pdfIn PDF document text
    • http://apvn.info/userfiles/file/71627885344.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/kepubonuliponusop.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/21834382784.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/ferisulufuvoxesavurizid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=simple+future+tense+formula+pdfPDF 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_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 18212 bytes
SHA-256: 4d51773971684fa0a1cd2810894d2fa2a9febf774b85a4f2b68026f7dfccce65
font_02_sfnt_off0001233e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233E 10832 bytes
SHA-256: 8d3ed279f0750e3df87d7f89e78b083ecbce9f39e3f9db75581875df1f097af9

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