Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4a7872c27dc5bd…

MALICIOUS

PDF

95.6 KB Created: 2021-08-16 12:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 351f84aefad6359a9948f3d699c0f2ce SHA-1: 57a8887aa5b8d30c7b18e3b8477945cb22c817d1 SHA-256: 5b4a7872c27dc5bde398232d66c680f9ddbb6f2fb200316563742e912d82564d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malware. No scripts were extracted, but the structure suggests a malicious document designed to lure users through compromised hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43292ff54---wizawojujeju.pdf In PDF document text
    • https://bustotoronto.com/userfiles/file/tuguwijomox.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/50662733273.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/pumaje.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16110100453eff---10591768019.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1rkir4b79qqcnhusmcujmi1bi/59735833314.pdfIn PDF document text
    • https://activepymes.com/pub/file/tejakijasojetam.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0515ea19---wibarekenozoroxatidimudaf.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607517087531b---80671023758.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uvf4olhh2lh68gsm05k70qve9t/samegofaxulipotaluruguz.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843b35c1ed3---47687708639.pdfIn PDF document text
    • https://chp-travel.ir/data/file/gowolubibedefabized.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/35054790498.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/322df1299c4f2c538e218702b0261aa8/81817696660.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/394eb4ba7055c90d54aa6be293da4aa4/87943084063.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/40307167508.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610310349a3b3---8832867513.pdfIn PDF document text
    • http://lg-palette.com/upload/files/jenew.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/kolopuput.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/j89mp4lplpf0e40g2u729tfuac/nokofus.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/nodoliv.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/mazolumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bancorpsouth+routing+number+tupelo+msPDF 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_off000112b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 16688 bytes
SHA-256: 66940044108cdfcf288183bc66f942e2e3ab7404391df8348ec4fec0c8a26611
font_01_sfnt_off00013e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15651 11112 bytes
SHA-256: b17a7b0fdce9d198306f4c08ba3db3225ae431828712fe362db5a2e2e34644b8

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