Malicious PDF — malware analysis report

Static analysis result for SHA-256 9938ce5bf8601df0…

MALICIOUS

PDF

85.0 KB Created: 2021-09-22 14:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f7828104bd83725beab07220821fef54 SHA-1: 88f88e112a8a39392d2a6d9b4bbcf6c1a9b56f71 SHA-256: 9938ce5bf8601df0cb8eb44e84333924ac253689446c2c4cde94506cee0573ae
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a malformed exploit stream and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tcsklife.com/filespath/files/20210912120313.pdf In PDF document text
    • http://gerd-pollak.de/userfiles/file/65270192194.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/bijibowebowe.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/wazitujigemakilele.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142d6f322c13---suguvuposabegosetirowa.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/roribebunom.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/xenig.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/pafinonedunodevanoxe.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/59130230965.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/fuvarikojunupelagiwipumas.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7f1a442ae983f541b53835543c842a17/30613599132.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210922_192304.pdfIn PDF document text
    • http://fitviewer.biz/files/file/wulef.pdfIn PDF document text
    • http://space-edge.com/upload/files/gawumuditakamiwud.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/69820088687.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/pilaxiwoxugaxuwu.pdfIn PDF document text
    • https://birudongker.com/contents/files/2121926796.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/tasizometamonew.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/jusulobuzutisi.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffcda3460---26051284852.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/97453658789.pdfIn PDF document text
    • http://liyangah.com/Upload/file/filefusaladumelixasunir.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/lenikepuvisit.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/48581499492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gunday+full+movie+download+filmyhitPDF 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_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 10756 bytes
SHA-256: 1be2b00d2ba1c2008c37ea2ce63d1842afd664c0c5a6257d3e8b1f6afe87934f
font_02_sfnt_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 17516 bytes
SHA-256: a8a400972a184681ec33567a5ff18c163a0a6131801279661db69875dd5aea99

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