Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b93b4a9fc155d43…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 17:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a59c6391bf2d237b41e57856130c0d23 SHA-1: 8a766ea5a703c1ac894ebe98cd03ffa8d462134c SHA-256: 0b93b4a9fc155d431085db289f6c75f8e55a22901077ac8918431d70e37ebb2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine its function as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.hzkontejnery.cz/ckfinder/userfiles/files/ximalepazazazuso.pdf In PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/27301872268.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/51804283115.pdfIn PDF document text
    • https://bunianco.com/other_files/File/dalikedik.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/zuzowuwuvifaxasisologul.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/28202637513.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a17951f634944951ec1e658c23f618aa/sotafa.pdfIn PDF document text
    • http://my-glc.com/uploads/file/saxutotajaxeweka.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/zulekogijijajifibizezuko.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/45990416492.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/3431123414.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c74b26511---mupiwedinemuzafave.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b94a84ad6---87456858029.pdfIn PDF document text
    • http://snft.ro/media/file/84463516223.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/55239092789.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/48822738254.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/xanubiwiwi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147d2899512d---wujokek.pdfIn PDF document text
    • http://hairandoil.com/uploads/47803736325.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614090ffb62f5---96054222508.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/zupenabetiseresipen.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109062152433929.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/9123e3c1ebdcbdb92d5dd0803913169b/61692793672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=game+damon+ps2+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_off0000b396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA8 17128 bytes
SHA-256: 6fdcafa94fd471f01678799b02836dccb6c5cc433b35adaa3c1eccc98c48a41a
font_02_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 10568 bytes
SHA-256: c6d58ac9e4c360be3f8ed2b8998e3be688764f8d5c9df04e74c4e4bd45ae4dc7

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