Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4ef16b3166f232…

MALICIOUS

PDF

76.0 KB Created: 2021-09-11 23:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d744905c43533a5f73b2f6605577bf15 SHA-1: c4b256ed830e9558973c1b554e2d6180047f85f1 SHA-256: ed4ef16b3166f232b12fde1e4f914fe1263d71e9affb7ba0abe77972e9218dcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://instit.ac/ckfinder/userfiles/files/37879017541.pdf In PDF document text
    • http://systemsbiology.at/uploads/assets/file/9180552448.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/bipet.pdfIn PDF document text
    • http://apex-architect.ru/images/file/72018421526.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/gadefegim.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/79969470242.pdfIn PDF document text
    • http://househouse.it/userfiles/files/gedukolawe.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/90448481331.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/lumujifobowariwawefenisal.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/xibogedol.pdfIn PDF document text
    • http://0048.pl/48files/file/wigozelaliz.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a09a9c46---xalevaluwolina.pdfIn PDF document text
    • http://feminella.ro/upload/fck/2944192666.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613488af8c138---nineburimisesixajolo.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/84940807349.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/15943561797.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/73269650646.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46410ad94---ditowebit.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/bubamisumu.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/33824263089.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/81218596970.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210909_9E16B7003AC7D579.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/woror.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/jowawavoladoxekanifu.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/76847373638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=clinical+chemistry+bishop+8th+edition+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_off0000c3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 16776 bytes
SHA-256: a3597af45ef128e52bb79afa807a48b7f0057b6d7470798fed17f0b2d7983962
font_02_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 11376 bytes
SHA-256: f73c9ecfef957ec0af0a7f5d91d228629afd49edae16d23b3ba01c3b840f1715

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