Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc4da1c7d586367…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 13:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8fa677581d87b94fed5519f594454cf SHA-1: 48a93a5553a6ddcb565a350de8bf1be3d7b127b8 SHA-256: 7fc4da1c7d5863678718d35c94d15b1f37098f207929bef374e6a088b1f38940
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://hansungid.com/userfiles/file/32345617986.pdf In PDF document text
    • http://mikol-styl.cz/userfiles/file/62465912461.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/58051368175.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/7683166366.pdfIn PDF document text
    • http://tochalco.com/uploads/files/53879683837.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/bavexufa.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/wewidigutigefanasimi.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/30477601518.pdfIn PDF document text
    • http://brukbet.com/user_images/file/malopojikefoguj.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/vawomuk.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/kekofijetumufuridozejojeg.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/89284273292.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333cb59f3b4---61243473512.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/39674352782.pdfIn PDF document text
    • http://erex.hu/upload/file/95978664720.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d72b29ea8e---rugakewiwa.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/rejat.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/61037707421.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/xazukewekoxodaxiwejokaxa.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406bbe49a0d---82074906748.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/50396040311.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/jiroxigefogoradamad.pdfIn PDF document text
    • http://kodemari.info/data/files/pagodofudigazof.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16132f531e48e5---35294895453.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/paguwuzalobew.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/50798255785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+pirate+bay+proxyPDF 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_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 10504 bytes
SHA-256: 93a0f9c567affd7b71c95ce5b63fa823bffb7af5c78108f7614bbe77acec1fca
font_02_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 17632 bytes
SHA-256: 1972d91438884302db10bb1fee0f4dc222f01647dd1325554b751797ce6188e9

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