Malicious PDF — malware analysis report

Static analysis result for SHA-256 84332b63f25506d1…

MALICIOUS

PDF

76.5 KB Created: 2021-09-23 22:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c786c19815cc422d2487a3fa5e6e8681 SHA-1: df0f8288011a985a30860d946b87005f94993824 SHA-256: 84332b63f25506d11f6a0080094786be355c9f38fc6c4181c3c656709a363d50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users to phishing or malware download sites. The presence of embedded URLs and the nature of the heuristics suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://huntic.ru/uplcv?utm_term=dls+2019+hack+apk PDF link annotation
    • http://goldendazzle.com/upload/quangtri/files/36231122935.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f67523a4e5---58808591956.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/tipevezidozareguk.pdfIn PDF document text
    • http://iccarrentals.com/files/file/54505443070.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210911_1814E85937E918AC.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16144318e2550a---votat.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161320fb10d059---71851012759.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161395100870ab---56546259353.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/42116574895.pdfIn PDF document text
    • http://liily.jp/upload/file/20210909091123.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/leroxotiwuwageradur.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/28c03778b8fe5089bc5e2d4267d0818e/50598783011.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/78326797311.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210904130355.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/70940943836.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/75265747493.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/guzew.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/56026270000.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/teveluvezamuvox.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/70616684813.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/34778123657.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219141351292483.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/79396708258.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_off0000c753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC753 17832 bytes
SHA-256: e2d30177f732a76259cbc417087ac220eed0420a3dc16174c81f513a82d85768
font_01_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 10380 bytes
SHA-256: 4710e9f17661571f6f1b9f47a69693f297f98ccb97024d874ad0ebcf93b321cb
font_02_sfnt_off00010ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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