Malicious PDF — malware analysis report

Static analysis result for SHA-256 116447325dbc352b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 21:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b16c36bfda5ac4e00340a3fd577aa7d1 SHA-1: 958eba07f0d662135a6c7644c8651efb64e94db7 SHA-256: 116447325dbc352ba5b22679e84d999334573da5e3566ed89c0411dca50f362b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to various URLs. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest potential for further malicious activity, such as downloading a second-stage payload or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=custom+rom+means PDF link annotation
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/mufasojetel.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/jadedimolomizinujepiri.pdfIn PDF document text
    • http://etnorom.hu/pictures/pobinokanixajuvaj.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/1045715219.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/94171792ddc63e6877a875eb0de751b2/28751178838.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bufudifuvovedekogoxux.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/41582918721.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///nilok.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/25677088055.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0a96c3d90---85876258165.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/34377051226.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5246182a---42499272526.pdfIn PDF document text
    • https://trieurodata.ro/images/file/73484746708.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/ganujenugepuv.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/xufetotojusorufo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/cca199ca83e1abfaf3aa6cef3a94f8a4/71362929405.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/15946190592.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/58757733642.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/tubakojerolisuje.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/zetawisadataz.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/20656189645.pdfIn PDF document text
    • http://koutingchina.com/upload/files/41962959302.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/65648193181.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/31928482711.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_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 10264 bytes
SHA-256: 951993ca3582ba8c30d0bc5a17f4a54fa1d017a408b3d1af7d1363faa0209c87
font_01_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 17920 bytes
SHA-256: 8ac7ffe17d2f46284d584f0e15f73ed9d1a7fe458246b3da4ee34b176e8d9932
font_02_sfnt_off00011cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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