Malicious PDF — malware analysis report

Static analysis result for SHA-256 71113ae3dbe7dd66…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 08:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebe28ef8f9f6e7d701852743c84a3913 SHA-1: 405f7813cca874cdcee6ca3ceceedfa21590e021 SHA-256: 71113ae3dbe7dd668ba5427526c70c91cce42b970c367a78c50f080fe4e81779
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malware or phish users. The embedded URLs and the nature of the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=kabir+singh+full+movie+download+hd+720p+filmywap+com+download
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/r96nhptj3372dobrrf7m94dfrg/felimisolomep.pdf
    • https://mamotato.ro/userfiles/file/39231250345.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/66190037269.pdf
    • https://kisikana.hr/UserFiles/files/74815401673.pdf
    • http://teplospectr.ru/images/files/21442229810.pdf
    • http://kuppersbusch.hu/userfiles/files/tajedebebebozinutepok.pdf
    • https://vyaspublicschool.com/ckfinder/userfiles/files/97174894597.pdf
    • https://cuichi177.com/uploads/files/202109100044583857.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/cf874e8855baea28d79a15231fd9ee58/75078188.pdf
    • https://viscom.bg/uploads/wysiwyg/files/17690092209.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e23f7ab488---vikezomosavibobagiba.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/lanorukepitavopad.pdf
    • http://kwong-cheong.com/userfiles/26632666120.pdf
    • http://terwaarde.be/ckfinder/userfiles/files/pedatugokidike.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/iajl2kr9ijsipfqr3o4hfk5d55/zojaxup.pdf
    • http://tunecharts.com/userfiles/file/norasoribilomaxefup.pdf
    • http://omni-links.com/images/blog/file/57398262939.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161461e69a1072---vifasibi.pdf
    • http://z-sinpro.com/upload/files/80629360616.pdf
    • http://montazerangroup.com/uploader/file/vujawaxukuravugale.pdf
    • http://terwaarde.be/ckfinder/userfiles/files/98193230294.pdf
    • http://datcat.vn/2018/file/kivenobojibavilaz.pdf
    • http://biblioteka-belzec.pl/upload/files/dipidivuxater.pdf
    • https://capital-publishing.com/ckfinder/userfiles/files/benaludexejelufaku.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db54.bin
10148c456452174d1f3acd90b6ee501327caeb048b4ef9ffd8204d3ce65d34e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 11760 bytes
font_01_sfnt_off0000f6f4.bin
d806ae78dda7b73a23a87135b259a2b686a91f909175361ce370022a9fc3dcfc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 20868 bytes
font_02_sfnt_off00012d98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D98 16792 bytes