Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec04339a6f2d376…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 00:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15277e38b428aba0bfd4d324d88f2cfc SHA-1: e54e9ab9fc536426de2b9f0aa42fa11d97cd7a66 SHA-256: dec04339a6f2d37660ea56cd5e809926ef6ff935a9fee3debdbe0ca9cdf89a02
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs to host a large number of links, likely for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=geology+of+egypt+schlumberger+pdf PDF link annotation
    • http://cdmvt.cz/sites/default/files/gejalogepolov.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/79679185690.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/54086198063.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/rilipekabamew.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/84945918032.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ca8271dd4---madovezoberipadog.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/66851102376.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-8/file/sutawutafatabuzoxaworexa.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/900aa37ff0b4e58cec548ef4cd62183e/zakamenimosorufow.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/32467cbcaedb6d31c5a2862afbb029e0/jitomigenuxuxogusaz.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/61558456154.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f260ce60a---13579239718.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ndm0kql76vh7ei5uv4egcuckv8/vowigadijajezepi.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd4042a78---nidivabawekenewi.pdfIn PDF document text
    • http://lawngo.net/fckfiles/6664291764.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/823387708.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/76198262486.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/49190612771.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c673e27c49---43207555946.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/lamujob.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/706725118ffe5348352f02784a117734/kojoseganukumevepuzuw.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/noxediwuwolerav.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/42412f6cd77886d988b2ba3094e94d3d/xaxewugowi.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_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 11100 bytes
SHA-256: d5dbe48fa4ac805aa6b17ccfb93c5df5327a8cfdc4cb08ca3e291abcd9d80b10
font_01_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 18536 bytes
SHA-256: 3ef54711cb2671dca80135b863e95d1dcd260c1a0edf8d1999db7d2066e34509
font_02_sfnt_off00012fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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