Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c57392ea2db3b2d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 09:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25217bda0d0950983fea1a9fe407ee55 SHA-1: dc8667e8dbbe0ec57c971b86209d18c43f8312ba SHA-256: 9c57392ea2db3b2dac8b7df351093a607aec6480bdd8788e3da85e8ddbe6470e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were extracted, the presence of embedded URLs and the heuristic firings strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613375877256f---mufufiminoxijita.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433ec4259db---welunol.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/goluwuvobikibotorun.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614009f37b144---dadufiziwabexokudisi.pdfIn PDF document text
    • http://rrarental.org/upload/file/perelajiso.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/bojavuretojoniwali.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/50209731889.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/fujavaweraxagoduxapom.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/vetofuwobelinefowifiwe.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/wavuninekubovusaraxirejin.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/25610241558.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/26426326377.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/14240769563.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/xebup.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/t7r74sj812vvuoi29f9eg4dbtj/86005201457.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210906132003.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/73764416241.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/20741678419.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/toged.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/nemuzawegefolofaxi.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/jixolise.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4d5d22ec35e604ff4381bfce2a239021/xasomeboxosimux.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/49662534548.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/gojoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+animation+video+maker+app+for+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_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 10824 bytes
SHA-256: ffa2fd34d6fd9310ed5ec631d9789e845ccbc2f3d23a956ba91415280b3702cf
font_02_sfnt_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 17376 bytes
SHA-256: 29bbd53a891fe4653d99e90cfddb4d21df6a438fc30da96a0201985836b0197b

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