Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ca24370fc3c123…

MALICIOUS

PDF

71.1 KB Created: 2021-09-23 22:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2f7f912e128726cadae9e30fee998ad SHA-1: e0546ae23cecc06761170801dbeb030b8d195a91 SHA-256: e7ca24370fc3c123c63d6f73fd469ade614fe1716ea3e0254755ada40139e199
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 or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis point to a common pattern of using compromised sites to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=jungle+house+minecraft+ideas PDF link annotation
    • https://commonlawhouse.in/userfiles/file/98117736095.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/modobozebisezavizawufarup.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135a76016b6e---jatobisuku.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/vutajalakige.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614138d78eaa8---65808904335.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/38086649462.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/a870362ebe0c16db66dac6136304af35/basurubumaxupaxeg.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/surawetivuwiwedox.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335cbb37d08---dexefatabixububu.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/nitavivakij.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/73427799108.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/zepewile.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/58723426998.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/zamemenifazivujasukekex.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/44916388906.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4789e954e---dulufubugadigagopeb.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/jazonarefagafowonaxu.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210915182025818.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/76394523709.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/nudaxomawexesedufuki.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/80306814036.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/fajiribagitusaje.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/9997670037.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/suxitajaxesoli.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_off0000b4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EC 11012 bytes
SHA-256: eb12c068fe8da1fedaca3ea343a1399d6c6ca5406b74b8e8020a7ba978f844b8
font_01_sfnt_off0000ce22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE22 15928 bytes
SHA-256: 4a2ed700191e464c9c5214512f5b912f876e2905bd197a6a4f885c32a99a8901
font_02_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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