Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6ffacade1664ce…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 17:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1b7f19a748ae982d67bbcb6713c4d516 SHA-1: a4b3cec07ff7e551bd2935878a4062fb2c7c9160 SHA-256: 8e6ffacade1664ce1e444908304b178d46a49a9a91fc2b5f9543a986f6f5d66d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier assigned a high probability of maliciousness. The presence of multiple external links suggests an attempt to lead the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=moshi+monsters+egg+hunt+codes PDF link annotation
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/nawefezuwosexedeweviwiv.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16321176671876394368.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/22805459361.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b31edb5b8---37597492781.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156664a19681---72655053288.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/48308307399.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/30650246417.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/kumaliwezuruzovidof.pdfIn PDF document text
    • https://miminku3.com/contents/files/pepiwonele.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/gunurenedifesoparewi.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/35067052686.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/99885608016.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/fijitimatexudibutu.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/rerozixotu.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/65402590981.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/kemazimixigelojexetiras.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/pajodajonubajawezor.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0c494f63d---96755502375.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8e5301ff1---boxisorigewuzivi.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/90406491457.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/11898006064.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/wipatitagegikivuxag.pdfIn PDF document text
    • https://areicon.com/images/file/tasexuwu.pdfIn PDF document text
    • http://xinnethk.com/userfiles/file/64380192080.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_off0000b3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F7 14996 bytes
SHA-256: 74ba31acebf8380bdd72eee600166da8a923a94b9848d3482764ba5f3cefa095
font_01_sfnt_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 10704 bytes
SHA-256: 59234e1562579c2d2c84628144a9287823b45e26d53d10e5e88862dfcef47c54
font_02_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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