Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced55dd7c9c0d4d2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 11:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9e01e7f243d5e2f155c3a72876898fb SHA-1: 51d8390a51050e02d754ea8a9eaf89bb514dcc17 SHA-256: ced55dd7c9c0d4d2caa52fe53e1047ff9c7ea618025fad61d520b4fd542f1bba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=2020+design+training+pdf PDF link annotation
    • http://myjobcareer.net/userfiles/file/2021071713581273499.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/lejejovowakilana.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/gadapufupedud.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/renutozutupunipafuliken.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3940755112---sudobigagarosixapok.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a702562b1e9---topovexisosojotagibu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/454c39758a132e5b9f8112122d694244/wojabogezamulej.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df3403ae7de---rijorukitekade.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a261b16a663---mujizabikemarefuwez.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da022807ec---kokosevad.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/75423085340.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/39068551387.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a470f2648b7---61709442689.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/16401285230.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont//file/15629936167.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/bupupizakeliwurupagudotew.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/83511012563.pdfIn PDF document text
    • https://vientangluc.com/upload/files/64872423661.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b31b762bf6---45866047281.pdfIn PDF document text
    • http://mrybalko.ru/files/67032079047.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/39579927920.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4glvt8giqsu74i6m7cpnu6bkrk/6013050040.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a55f5d6d3f---zalozawizakagewude.pdfIn PDF document text
    • 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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 17180 bytes
SHA-256: 8cb38366f8c0dd814e1b58b7779a3d8a5bd76b626c2322b36fc8bca6a2705ae3
font_01_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 10652 bytes
SHA-256: 95a484a0ebf59556e0e14ddd81d570eff3e62457588088988a5e2e13ea09e8c0
font_02_sfnt_off00011f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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