Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8a4590114a6961…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 17:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 665c14c1692e2aa8f5037fbe9016b5ed SHA-1: 2b4b4a37245b7f3078f5296e7f57db01e1a37930 SHA-256: 1f8a4590114a6961e12824d9ad2c6f1fade2ea8bc3009b3fcd040c4f0f3c520f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to external websites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or phishing pages. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user interaction goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eska-lift.ru/userfiles/file/gakelorojavefa.pdf In PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/591e7bd2d3bbfac3e7f8e15bbb2947de/72313869436.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160715b0a95880---kevisonosaveli.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/94701353938.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210905043404_n77fzu.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/padipaxonagujoxotigix.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/lakebunubetogoraxetenose.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-3/20210703180730629952.pdfIn PDF document text
    • https://slide-bearing.com/d/files/59631229474.pdfIn PDF document text
    • http://jsdarvin.com/files/kagururexa.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c9e2bf2bfc565f3c8818c067130050f8/19607028156.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/zipexetadikusufi.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/30200735437.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/76f62df37c3996d49e9ca34a03754c3d/subimazafasata.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/wukenow.pdfIn PDF document text
    • http://screen.by/images/file/malukadij.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609002411c326---xazobowawusutekujoginus.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/lajelinekir.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7a6121d52607d90514e774278d1fe217/renamuwikuvefimoronebe.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/77563779631.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4cf63d43c---xekamekejomewoxa.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210623024240_8km5gn.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4bfdb19d---12421526739.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/796cd8b2362bb75d4a1d10f7c1784de2/doson.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/88621893719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=alter+ego+a1+cahier+d%27activit%C3%A9s+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_off0000bf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2B 11080 bytes
SHA-256: 52e10176d94d1749927be7835f91dbfcf2e3d502337c31ec4f7f24bc5db4be48
font_01_sfnt_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 18740 bytes
SHA-256: 7641dc9a1ca952b0f004f80ae86a10bdc75107b0f99bc7b2b2ab0079db578ae5

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