Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36bfe4e6df33475…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 01:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 418a102107c68ed73212049cfeaa421c SHA-1: dbd45beb0d8e9442346f4211daa4c7998136dc1b SHA-256: d36bfe4e6df33475533106d042965b43bdf5b65887f5799cfe485c4393b29c0d
164 Risk Score

Malware Insights

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

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, directing users to numerous compromised websites, likely to facilitate the download of a secondary payload. The presence of a visual download button further supports a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=convert+pdf+file+to+smaller+size+online PDF link annotation
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/53aae85b1fc21fc603087ad5e75b4871/dedagadomatisazar.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ecc5cae8a---munabedirokikuwibuzoguf.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf6e8c912d---78280692602.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/tiluli.pdfIn PDF document text
    • http://client.diffuse.info/files/79486821842.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d68febb42---88643953559.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/41082729715.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533939f015---noguvemasakikagareguves.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab27f7a8a16---93096870915.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a260535dadf---41716484464.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/50679053164.pdfIn PDF document text
    • https://sainaudit.mn/File/85577118339.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79310941757.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b491c4b86---76050944120.pdfIn PDF document text
    • https://tisuputih.com/contents//files/85132998991.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/23694616458.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/60164581798.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/85e3036979a1824e76e94f70afbb3424/fewovejegotoloxebe.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/69159996647.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210709054201467540oegb5.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/99591b99b675f6d06c39670fad688181/33157563246.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/27867386348.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_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 17920 bytes
SHA-256: 00300edf041fcc4b0082b791b2d32fd2c2b3fa0dc45b3fcf45cd6c5dfed4770d
font_01_sfnt_off00010f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001274e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274E 10816 bytes
SHA-256: 5b28cf503483668c5e711b2ebfc1392510a190e1b59f273442d6e68dd494a411

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