Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28f5a758484f109…

MALICIOUS

PDF

101.8 KB Created: 2021-07-04 15:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e8c5f828f23b6525c2562427b7bc5523 SHA-1: 8ae2b39a1ab1c48dabc3f9929e7ee66799c7f095 SHA-256: c28f5a758484f109a5489aa6182fa1b485824e4920c7201854a5b857fec3386e
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, despite some being marked benign, are part of a larger pattern of redirection to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://nedirajtebosnu.net/userfiles/file/24626723680.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/da52e6a0289e25998eeffd6958baf045/xivuxafalukozexag.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f974d4c176---larevunobosoxedenakamopan.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/be1b09c5ebc89428093628b12655a7fb/wenisirepajetukigunopuxo.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/9klpq7lflint3erfmdrljobros/diwavit.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d0b1ec17bb9160f902b307acd2488fe8/69652474237.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b32a3cf56b11235cb9390fd561e5157d/tonaf.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/9634755917.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/pafijek.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f87c78682c---40506209264.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/47668178176.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a8c88c5e---xotidupakejuvogo.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/51243534504.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de39a4b01d6---rezukufulisob.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160908d7aec1be---faxazinebuse.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/jidugukik.pdfIn PDF document text
    • https://kham.vn/userfiles/file/tixefulobufoledilu.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085a5afced05---25188645378.pdfIn PDF document text
    • https://kuepancong.com/contents//files/kulobudaxafinilov.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dc10a48be1583d6a0fdc529ad5d9e9cd/guzivegogaxagepagodoj.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7uhfnhfeqn0e5h03vackuja661/wemakejemoxogewuzeb.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a12851e13---29540150743.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/25723022648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=red+desaturation+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCF 17420 bytes
SHA-256: 5c9328f8c9e09b0cde769ef8bd74a185652b5d9a930aa0b5bd02057d560e3854
font_01_sfnt_off00015a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A37 10508 bytes
SHA-256: 02d1b57b11aa410fddba1a058c4a16bb5f2b7312f3598d7e3c966c8b0a879b44
font_02_sfnt_off0001721d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1721D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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