Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4699f26e2f2c7b3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 16:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c451ccd5945c253b1932505e855b863 SHA-1: 9d93eb615ae14f6a664f09ed952937d4dff68cdf SHA-256: e4699f26e2f2c7b35693355a0f090158a58d1471c55e62fd5d1747e48b256634
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the document being a link farm, directing users to various compromised or disposable hosting sites, often disguised as PDF files. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://jss-moms.si/upload/File/totodugovijaxezodenis.pdf In PDF document text
    • http://wonderpanel.com/app/webroot/img/file/8098969504.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/nujoragi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cc83c5f88---titapinodupetuxuno.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/86125379812.pdfIn PDF document text
    • https://pmms-online.com/assets/file/25869468295.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/xipibodexefivivivelubo.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/kubozofaxejilobisososibu.pdfIn PDF document text
    • https://codecs.ro/images/file/18248370871.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/616453599.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/pisomo.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/nupoxivunarunudutalolaj.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/nfn2gfc9mjvgjnthfen6ck8j82/92964292242.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/42125001526.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/buwadopupelumi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec69547cda---97350040526.pdfPDF link annotation
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161336f84618b9---44052216827.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210909145159_148584115.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/48463579294.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/89224507303.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/81546733961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cara+mengaktifkan+usb+debugging+saat+bootloopPDF 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_off0000d20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20C 11204 bytes
SHA-256: 8527ae16b3f7b02278d3a6ab645414145ff207bfced3f3715f0df9f11c0f090e
font_01_sfnt_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 17628 bytes
SHA-256: d0a6dd9a473b99eddfb447c37858db49f824920cd22ca9be4ed88011cc63ce02
font_02_sfnt_off000119db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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