Malicious PDF — malware analysis report

Static analysis result for SHA-256 32570dc5855cfa1c…

MALICIOUS

PDF

91.6 KB Created: 2021-09-06 13:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13c756708aa22f65eeab6308b516f1a5 SHA-1: f8192c8413a6a5406afb3e1459d44ce430df8f8d SHA-256: 32570dc5855cfa1c7356adb071d109736febded3171c96123e1810d7a1c467bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document's structure and embedded URLs strongly suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://ttccid.com/userfiles/files/gebejujom.pdf In PDF document text
    • https://tese.in/ckfinder/userfiles/files/xikubuf.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/scoa0ha4adsutj7nq4vpu0ne2r/revapuwoporekivasinebana.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/wozaxasuzebaxafoxigabulo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5337e51d---80235235714.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/39372374370.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/janulukoruvonavekugubumev.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/32695851898.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/aa9060dsedbbol8464jm7vn424/20451258201.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/15223424037.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/wepemuxewowunagopoz.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/tolinirazikizaxoza.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/wufejasofazekekutosako.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/xakivexewodi.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6adc46704f3b9151d8ae3acd2368bf0b/sexonegirafabur.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/vizakeguforupux.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/77754692606.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mohbhvgccvcdskcfsftgujrn6d/wosas.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/2722158694.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/onsmcoa3uecfb5lk3iobgk3brk/48083816181.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210821_92E189D1327C0A84.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ljto78j3455grggobnl5r72j84/jugewidemunosegorerode.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/8a8fa865c4eb669525185425419ce112/kujededopopafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fortuner+4x4+manual+2016PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 10728 bytes
SHA-256: 3933100f74b02479fd0abb4b821f0ec70c0e053025a0733e0eda7a458941dc90
font_01_sfnt_off000117ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117ED 18668 bytes
SHA-256: df403427e398d0c5587eb9977e4e3be2a17a0e82ecada3cb79a0e8f6e2f5944e
font_02_sfnt_off0001486e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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