Malicious PDF — malware analysis report

Static analysis result for SHA-256 63be7d3ec80ef94f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 12:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3817ee20b181f1aee7c0176b55f326bc SHA-1: b741a9604cba3ab64bad5d7183b01a80fb53d1c6 SHA-256: 63be7d3ec80ef94f63b822ea71fbcd2e242583c6af836d405647b0be57e3f90a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be redirecting users to potentially harmful content, such as phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bhandarisurgical.com/ckfinder/userfiles/files/vikupit.pdf In PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9d0f2394554ae42aeec5ed4d1135bc02/83132134367.pdfIn PDF document text
    • https://actor-conseil.com/files/file/12321510349.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36437617978.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/18075649487.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/volawakuzogajigi.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b44d0eacda07ad935c418330de9c7a34/86230379179.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/47966722983.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeeb645099---13415420182.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610545af4d8cf---84590723714.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca4678910---81398567400.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/kemokonefuvavojivukawuwom.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb4c035024---zidusavititiwite.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/xafolebigifowa.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/vizepigiwiruzu.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/xiranuxarin.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f19445146ba---77706730969.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/25685007850.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/77621546912.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c0229fcd---dovagufofagodujepam.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/06fff46508b2c26837561de564fd6089/nipaniz.pdfIn PDF document text
    • http://ccadl.com/files/20210903103320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=jesus+at+the+center+chords+key+of+a+pdfPDF 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_off0000e129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 19132 bytes
SHA-256: 1682498c4c966ee0aff13f4dc4c2d4df76885bb52d7c665125a7bb1cf9d71063
font_02_sfnt_off00012b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3F 10876 bytes
SHA-256: 71a10ddcfe092a1a1d6caaa5cfa02662951b06aaa68ffa9929e3b8f212796a97

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