Malicious PDF — malware analysis report

Static analysis result for SHA-256 477033575fcb43e6…

MALICIOUS

PDF

70.4 KB Created: 2021-09-12 20:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55ed0c04cd748ca8dcf6180891e5c145 SHA-1: cb9223030e6ed26280f7399c74b2d89d9d121629 SHA-256: 477033575fcb43e648dd50219715211ec46ad787954465db20f3cde03cccef22
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://gestaocipa.com/public_html/Imagens/file/95343848588.pdf In PDF document text
    • http://tbeaindia.com/userfiles/file/repalabobitafewiwilut.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/lulokaduvuzodekupetop.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/gatedesumite.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c889ab3abd---mefamivodivufudidedere.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/manaboditefewon.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/17616532761.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6255d6961---99521161634.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/tubodaxafufeke.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/54540848328.pdfIn PDF document text
    • https://mackbeks.com/files/file/85080562515.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/soxupagexebimiva.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/fisopajupuluxi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/uuem14b685q6r4erqgd6clfl42/74601083946.pdfIn PDF document text
    • https://subarini.ro/mm/file/dejojazurutosoxaretom.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/79eaa4432f0588291d35b396c8a34dac/6532735303.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613328c4d37f0---zexumevilipej.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/69777783644.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/70945046971.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/56778001393.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210902_D8F3BA3F58673704.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/65133385691.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/xeginivavabog.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/99927270238.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/25972817034.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/3c3868b2ad1e4a1f4f9695da6663eb1b/bonobifidukojilumibudofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=popcorn+movies+free+download+androidPDF 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_off0000b620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB620 10836 bytes
SHA-256: 611f32c41ac01d887bb22c64b4309fecaf7be1a0c7e70b393c89d6cd5e353913
font_01_sfnt_off0000cf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2A 14564 bytes
SHA-256: 66f587ca92ad21c5be9e9742ec4258039a5c14e875c433b15281498944c58e10
font_02_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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