Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacae919c45f466f…

MALICIOUS

PDF

96.3 KB Created: 2021-09-15 17:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c10a6278fb473862c61dfa775782753f SHA-1: 998e1ebd6f7534abe454d1731fafe083e47d5784 SHA-256: dacae919c45f466f0b01087d9396c8a4b344134977d6a9e441bd0addd347d7c7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fields-on-earth.com/images/blog/file/wosenir.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c338ba2be---kobepukonosiwoleginow.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/11681229962.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd52cd14d4---50159536965.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/8ejb5k1b150ecik5hjj9u0p296/24563196523.pdfIn PDF document text
    • https://digireg.cn/upload/66556467156.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/89264717647.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/luwil.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/lunuvaka.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/diletimilozizobepi.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/mabibu.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kudiwakoxaw.pdfIn PDF document text
    • http://reichspfarrer.sk/file/joxejanugam.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/22872226947.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/gisaziwegexosafa.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/kugesasixekemimatatogen.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/45678873071.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/pikeseritenoxufisipemejak.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/78469714023.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/88365112981.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc9b4904e---40461934085.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/risawijusu.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210901_BC8A99550080619A.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/66873400892.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/lejilofawofuwonomaje.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/riluleripotawejesanul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+open+more+than+one+app+on+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_off000114be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BE 10520 bytes
SHA-256: 87cf337e1dfee90f433a42560a2f64387dc2c86b74d90e8c4a81e80b9c3f2c82
font_01_sfnt_off00012c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C73 17912 bytes
SHA-256: a410ba7b7bf24e49bb0eb71e5c8bdf88138dd4d53aeb7f123dd0ffbc8733dbf5
font_02_sfnt_off00015b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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