Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0be02a36ade633…

MALICIOUS

PDF

89.4 KB Created: 2021-07-22 08:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 10731c632f325ecd35a9ffbe8f95bced SHA-1: 45d7bc1af11281926eeeca735436a7f58d1120a6 SHA-256: bc0be02a36ade633879ea18639dd683abab4a23138c818956f5da4da3681e956
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/j05on5ot7vbbi2aim61lf8ho96/94868524366.pdf, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8ab3a601544700cf96bc47483c9fb60f/sakanulizapevowanoz.pdf In PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ced195848---77159477247.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/soratubasubalaxemede.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9d1e22e28---50935211250.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ai5kc00ppup3vp2t1vo3neln4h/gomekubu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a54e15a6e854fe50eb43ef61a0fed18b/77666891464.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/xazofuxotumotew.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/j05on5ot7vbbi2aim61lf8ho96/94868524366.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bd99268bb---foditinorifozaginerevo.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/jipiut3pp2outal0f1po4b0580/86742854874.pdfIn PDF document text
    • https://hcviet.com/img-phuctri/files/75305595861.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e2fecd497edc0c68dd4e607eb2bb8a0/dedaperirazotajuv.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11754eadc4---45482013967.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6bad0be78---revisuboruri.pdfIn PDF document text
    • https://ms01bet.net/contents//files/36409838766.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/e2536a22d987c1896296babd68f193c9/guzinavarufexatetadaju.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/zagepabivadimetowawisar.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/kujipewepekogi.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/5c3450a6114e2daf8dbcb5a209ded778/pogapagoturodutunolukud.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/60063401008.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5e0e81e23---26533476021.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/60198432621.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/11234185188.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/stuucrvm9hgh9aagtf33fi8cg5/xukagexunenuvod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+xbox+controller+settings+fortnitePDF 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_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 10644 bytes
SHA-256: 849cff3e42ea8b2989694a2789edce432ee9d5a070bbf68545b656df1471b917
font_01_sfnt_off00010f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 17280 bytes
SHA-256: bbe6690af2fc62b41c3a1961d62064f9453acf0b497eaddea28b78098a8a70bf
font_02_sfnt_off00013c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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