Malicious PDF — malware analysis report

Static analysis result for SHA-256 8971964d54316b2f…

MALICIOUS

PDF

73.4 KB Created: 2021-10-01 09:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 47d783b1eadaeeb6b79b19face08c37c SHA-1: d14333d98fd84dc4b21c437773fde546269b902a SHA-256: 8971964d54316b2f113f5e9820ffe2f7bbfb90d6657b6b0e683b2d95d9d47cc2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'SE_CALLBACK_LURE' suggests a phishing pretext, likely aiming to trick users into calling a fraudulent number. While no scripts were explicitly extracted, the presence of numerous external links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=my+hero+academia+episode+1+dub PDF link annotation
    • http://jvcc.cn/ckfinder/userfiles/files/210927224509798335zvilr.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/milukukelabubebepogoke.pdfIn PDF document text
    • http://szhlfz.net/upload/37369456256.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e44b16676c3816f02a2a590aa0b84032/12701135942.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/xuvuvuposutidop.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/92270495873.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161557a174348b---99085957729.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/labukivaj.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/molutifedazupozi.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/34425820287.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/93745a72654c644e3c1cf2964074ec67/7352027807.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/fenowawukiwoxomibifafaxan.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/ponozosikubun.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/17872569547.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/70472725886.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091400445315.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83d231399---7289852369.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/64950473768.pdfIn PDF document text
    • http://abwrva.com/uploads/files/75829410364.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/fumogufexad.pdfIn PDF document text
    • http://myesen.life/userfiles/file/dototarimidofuvataro.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210924075156_1393024359.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_off0000b22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22A 10932 bytes
SHA-256: e39cb814fee946a1be1600bc5947128c7de639e939d522d18d403c49f64ddb38
font_01_sfnt_off0000cb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB53 20656 bytes
SHA-256: 35d0c80a5720ef5d28d6a900ec179679d48f80c0f866049a8b6b045796340f18
font_02_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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