Malicious PDF — malware analysis report

Static analysis result for SHA-256 9255695ffcc1fbed…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 02:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 315c76c3542080f51a11b597e9e12a3c SHA-1: b6dd043e3340db86d4007b3e4b2c9cf54365083f SHA-256: 9255695ffcc1fbed68686cbc1e87011acef62bb2c72834d86f57ccef3ffb878d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. Heuristics indicate these links are likely used to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://fleschimmo.lu/userfiles/files/berukugoban.pdf In PDF document text
    • http://targhevaticane.it/userfiles/files/4803950214.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/pepifapobawa.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/85440142218.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/76ritb214dcn7c3ianceldgqf5/bawokisudegalinuripajobot.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/17272132d8627009b492ef4896951d1a/bipaxa.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/pamixipexejisaridalojofu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/d6d68b21c0efb30795f95ba01e7fc68f/wiretexizenozozavevenopo.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/gasonexiwil.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/finofarupofomum.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a545596b6d---95621173696.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/vasuxoxarutajikenoge.pdfIn PDF document text
    • https://strechybenesov.cz/content/93613186008.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/ralugixarazegulopumazo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f81bc220e85---remadaxa.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607246bd87d1a---56213966326.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/savevefoduniron.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0f0f22585f4ad411514f3696d940f2f3/bilafisenusatun.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3b4acfb8f---37800522927.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d687161676---75694879244.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/52792962834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=presonus+quantum+user+manualPDF 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_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 17888 bytes
SHA-256: 1b130f1f1350335a2c8dbec7b3e489e9ba94542daab10b1c47e6cfbeb3ad2a53
font_01_sfnt_off000114ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD1 10424 bytes
SHA-256: d888fbe6b5691ec23b44a14504dc21bf88c62eba143047930ecc7c0775d88ea5

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