Malicious PDF — malware analysis report

Static analysis result for SHA-256 e585ba425037b1db…

MALICIOUS

PDF

93.5 KB Created: 2021-09-08 06:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0dbe464e53f3752995147c4297e0dcd8 SHA-1: 7bcc49dd3b4a396af7f87352000b0eb0d0d4498e SHA-256: e585ba425037b1db0d39a3a85c32f53b31fbb8468eee4583df7640d09a0a98bd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs and link farms pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://renfrewareahealthvillage.ca/ckfinder/userfiles/files/xugotazepenufezi.pdf In PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/pukufagasezilofo.pdfIn PDF document text
    • http://bakoca.hu/files/file/61810805498.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e5ac4f18d14bd93174780a1ac41be152/31095839918.pdfIn PDF document text
    • http://air-ned.com/uploads/files/93674512405.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610418e2660d8---8861168338.pdfPDF link annotation
    • http://cnc-soustruzeni.cz/files/file/3593872484.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b603e8a127c---mazenukiravenuk.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/43188700629.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/89605157979.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210810071143.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/016d0f7ce8e2807e3516496016532258/gilonenusabamibibumebas.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/86798216434.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/23125748701.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/fiperegetarebesuzotefadeb.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/faxawiduxiguvekavusife.pdfIn PDF document text
    • http://beateromer.com/bilder/file/kesogisekudojaf.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210825172840.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/k045aofosqif7bv729r6r095e4/kubevomibapixotimixu.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/24080581298.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/latinesovapelaratafif.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/69343090005.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/jozerowisekigeragut.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5ulmur93spr2b7en9hoemeq1c5/gixokoruzafofif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=literary+stylistic+devices+pdfPDF 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_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 10528 bytes
SHA-256: 24adfb1add79f30f9efb8427b6feeb3d4742e1a68dd6fd126306f1036fd20004
font_01_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 17360 bytes
SHA-256: 9b237b2d5e73291f743f6a00828b37c1a4e10a83ae8537e0397b9a69be7c25a5
font_02_sfnt_off00015037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1