Malicious PDF — malware analysis report

Static analysis result for SHA-256 a018f5387d0c7f00…

MALICIOUS

PDF

91.6 KB Created: 2021-09-08 19:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 954f1d35479f04592ab5fa6ec957de5b SHA-1: f8c109ac1d0c8d37156b4e27f59407e0b02b4859 SHA-256: a018f5387d0c7f001da98bf57e493fe3481d25edb5916cc4fb091f8d7a24990e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://hsse.hssanesteban.cl/files/33438167424.pdf In PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/89333194126.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/ditujudexogegejironubifi.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/22100130938.pdfIn PDF document text
    • http://tid.vn/upload/files/65781186959.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/kakodipiwa.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/xoxad.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/2422938969.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133222353c86---8439062434.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/33146557500.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/61689882544.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/pekam.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/gosimubogapajubosu.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///sekerokunopibebivitiw.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/tukutipamovi.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/18664508949.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/1cgd13b21djp6t3gkt6cjoc9ki/29539152854.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/jirasinomawawupize.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/gumepememamerezadoxatej.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/tidozilujuvosure.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/30119857080.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210908155412.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/dawedotesuli.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210907050745.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2520097ac4a7a222872e7220f9dad361/77378824134.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/zerabomufebebiritubeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=creative+sound+blaster+z+bulk+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f69f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF69F 18788 bytes
SHA-256: 998e602f235b05e131d4daa319507cd57a3bcbb2278f779422ab8ae421117171
font_00_sfnt_off0000de8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 19128 bytes
SHA-256: 1cc04eda2a8012f4a637ad220d9216bb3066927536eb274fce7840e4e385552d
font_03_sfnt_off0001473d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473D 10896 bytes
SHA-256: 9e1b93846b9fdb1bcf7b619a29b57e5fda37ea8fedc6a6b3d12f87ef0be91b6a

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