Malicious PDF — malware analysis report

Static analysis result for SHA-256 3015fbc1be180061…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 10:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c286f6c0f741b1a55d5eada74eeae1d SHA-1: 83f815934b33e9426b308adc724b6d238188d830 SHA-256: 3015fbc1be1800614848973f5c2687a18925b1a2bebf8aecda0988b3ebc2c2ef
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely for SEO manipulation or to distribute further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, suggesting a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ebiocell.com/uploadfile/file///2021070214234771.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bf71c660---kivufopiwimedifun.pdfIn PDF document text
    • http://zuche0551.com/upload/file/dunagavasikilowusukuzer.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6b80f5dc97b209957301f9a9ae456519/pamabigigiboduwakus.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/51724642839.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4872512a70---luzixazubugesemagijiv.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/30343911646.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/h1d0e5d5edi0ig5jiml5ffgmoi/72353672725.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/uc0lp9dkcf2kab00agg8bbbjb2/dozubimotoxi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9571c65a0---wolobakefokujo.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021051803122045143.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/sukemomeki.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/nexopolugitoboxo.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/14749768.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/kevalovazezu.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/zesanitezogefubirifupenu.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/8656991374.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/birilelepadexeve.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0ec067071---tisirafitanipuralufalobe.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nevoramifuguzugonesokel.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/52455466906.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f80f77c232f34332ce51fd1f24530550/vozabuvijog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=all+indian+currency+notes+images+pdfPDF 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_off0000caa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BB 17884 bytes
SHA-256: 431d78a5c53f0abfcea5de2903e7c65887baefe419a65ca823e9b2bc5f76f725
font_02_sfnt_off0001110f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110F 11160 bytes
SHA-256: b1c719afb9e7c2f63ae754d6ad6353da33565d508607008a47f9eeaa38cf7edf

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