Malicious PDF — malware analysis report

Static analysis result for SHA-256 6596cfe82f440c79…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 04:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f73a6c1b08ee23ec47a7e706080abde5 SHA-1: 62f41470fafbf48601bcea1de3d47f7be2f51bcd SHA-256: 6596cfe82f440c79f16653117c89af2dcb7869e749428e12dff9753a33f35e6b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple unknown PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ourlady-schools2.com/userfiles/files/90941283024.pdf In PDF document text
    • http://fashioneducation.ru/userfiles/file/35247970830.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091112341577.pdfIn PDF document text
    • http://status.cz/UserFiles/File/36301068289.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a14d16bba---65414505976.pdfIn PDF document text
    • http://ingore.cn/upload/files/45198045038.pdfIn PDF document text
    • https://guijek.com/userfiles/file/kexatulunerobisator.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161391286d250a---metorixisuvujikepumuk.pdfIn PDF document text
    • https://ocw.tw/uploads/files/luzexafomujesenozima.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/74499244877.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/leruxawamasuzirilufena.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/68552847323.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/39229697011.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/65361170317.pdfIn PDF document text
    • https://rm-parketi.si/uploads/50901475006.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/vapofolase.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/mikusadarexiwilik.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/runebosewusomadimi.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/pewubosaluregod.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/1408572174.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/zawemofis.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/11f8d8eef8b0d196bfa5bbad9c13576e/18233847111.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/79066424977.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/24468170433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mencuri+file+lewat+wifi+androidPDF 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_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 17892 bytes
SHA-256: 5b8c7286f1d7a28fefaa91724ec6915fec03c29eea15710952c5e5881824c9e6
font_02_sfnt_off000125a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A5 10480 bytes
SHA-256: a7c150baba057bf90598d56183a9d5fecded11991cd8b1dfa6decbebbcc127c5

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