Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42bb41c72ea7c3d…

MALICIOUS

PDF

100.1 KB Created: 2021-08-10 20:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8dd1bd9a377c4f4fe74eeee46ba2789f SHA-1: 0d4b08c1f6b3cfb2fdcf42eba4d61c8ef15e5ab3 SHA-256: c42bb41c72ea7c3dcf5ab9d33dc03655b48f417e5a6395f9ea4c5b75fcd6f9dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded links are designed to redirect users to potentially harmful content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b139d63bea---sidijubarixezotej.pdf In PDF document text
    • http://reicar.dk/userfiles/file/tefinumoleg.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad307b64a---1908379191.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b784d4afbe2---divezi.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/36oa8b7iq2rr6or92d2uroqhl2/42576667596.pdfIn PDF document text
    • https://wita.lt/images/files/69146331718.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/pulesiruxifelokujugi.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210629143238.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0dd802c904df0eb866dc5d8796cfdedf/kulen.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/kapudifupilireruzukewoxiv.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087144d472bf---30218870820.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/ligepaj.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/j40bvffurubksgm6er75c8i4bs/67748684447.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/tamufexujaba.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/53587941387.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/bopuzotapuki.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/zulosomuzubizibugokiz.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b30110d0831---lurikowasudutizedonu.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c0df6598c---39435551404.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b72060e9f---kafekasivu.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/2993002470.pdfIn PDF document text
    • http://renovator.cz/files/file/48563087095.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f7c59545b7f3afca1a998ba36e8e282a/wajetoseforo.pdfIn PDF document text
    • https://majubesar.org/contents//files/duledefogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=shelby+county+il+sex+offender+listPDF 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_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 10940 bytes
SHA-256: 0145b940a666dab88b2c0323a5b8a5aa36ac53fe14dbf0015173a2b7e294d863
font_01_sfnt_off00013bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB3 18336 bytes
SHA-256: eb6a4f3aef0babc4e7882555bdd347d6c57a4679a547a465d759b48cb727d372
font_02_sfnt_off00016a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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