Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4e035842281f16…

MALICIOUS

PDF

75.1 KB Created: 2021-09-02 18:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 496aa1f9745126c70adc7f0bdc6f83ac SHA-1: f29cc9ca81bae175d44f3dd03a27d36940fe346a SHA-256: 0e4e035842281f166acd2eacdb740b26eb5c8a87300159dee5a3e95f3deff531
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of URLs like 'https://inwebjor.ru/uplcv?utm_term=amplitude+modulation+applications+pdf' indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://inwebjor.ru/uplcv?utm_term=amplitude+modulation+applications+pdf PDF link annotation
    • http://exdebt.bg/userfiles/file/35253572672.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f277567029---vuzegemo.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/47776166711.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/puxivun.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dab709e1d0d---buvopuge.pdfIn PDF document text
    • https://menu2uplus.com/images/file/gasuladelaf.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ke14no4q6g5ckgdqce3i271ml8/32906640893.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210505200550.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/5d4144e2f5bc746769bf1eb7ff6ca23a/43563453623.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/74398229532.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080646c54c5f---rarenojazadajewum.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/duteraxusazakofov.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/pojebubujusonugigiga.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/pojubamoxak.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/77667543440.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/17503166902.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/46bedce446631ddd1bb67ec9506475d4/51390870032.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/lapagurusawimijadud.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/72013872559.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/51a2bf346ea47026566e1e45aaaeb312/kupomi.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/58631106412.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/87738792414.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/sogewogexomaliv.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/64712931848.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_off0000c1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C5 17300 bytes
SHA-256: f287f1a6efccfce9e498f702f2edd1a1b0c71130635658ebf9e00c01e9250539
font_01_sfnt_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 10760 bytes
SHA-256: 5fcb7afaa79bd93208fb46ad15bb0cba7f2542d1166cd1d24f832f9981a0d35e
font_02_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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