Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5169ee8beea591…

MALICIOUS

PDF

97.2 KB Created: 2021-08-09 13:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40f1e4df3102b56cc025b077748758b6 SHA-1: 3c0ba795e33aeb91ddd1988eb0234f86ba951cc1 SHA-256: fd5169ee8beea5911ffd13a2d07eba4c3f32b08b6c782535dc7398f7345adc41
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, a common technique for phishing or malware distribution. ClamAV and ML classifiers strongly indicate maliciousness, with the primary attack pattern being the redirection of users through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/tr1m0n4mta3h0g52r3plp0p41k/76069006391.pdf In PDF document text
    • http://midel.me/userfiles/file/jajitaxuwo.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/kiwatosokapo.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/i78qjo2ifp7192h2bqgdqla90a/81207081875.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/videkat.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/gipofixu.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/49268755504.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f83cb657914582b0005ac11c92323e08/20615994669.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/58224294552.pdfIn PDF document text
    • https://www.verimevzabavu.sk/ckfinder/userfiles/files/povepajekotirov.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/6893509869.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/61f6db22b353981044504f818cfae32f/dikewoguzobatutekudekesa.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f251b9e0c8a---92285062725.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756b55aca08---76278350003.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/ninigawowexofefisofu.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08d89db53---27172093323.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/36575542120.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b4507555b9f---tabubejiwab.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba384f193f6---27461033935.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800b8a466f0---xuvafutoposixupapixepira.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a98ddca5452---biwajonuvixiwegumakisipot.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/siferobirovudenose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rockin+around+the+christmas+tree+ukulelePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 17652 bytes
SHA-256: 731fc9506c5352efecdae97620da86c50d289c8d6ca085cbd2f089df5c44df6a
font_02_sfnt_off00015112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15112 2440 bytes
SHA-256: 4b7abb560c88ab41ba7a7ac92313e2f9da5e951066234e25ad8347163921afd5
font_03_sfnt_off00015b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7C 10872 bytes
SHA-256: acbaa7a3d1a28a2afb23f4923cb877348c70c9f6126fdf7863ab8bd8042952b9

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