Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfb43a5f3043518…

MALICIOUS

PDF

106.1 KB Created: 2021-07-05 21:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a7eda3d890631135516f6c98015807c SHA-1: a1b2298d1886a54989d920e723d3a64dc0b4e27e SHA-256: fbfb43a5f30435181ac401a0807eee2333e09d59ceccd2d219fdfef6f0ab7104
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, pointing to various compromised WordPress sites and disposable hosting. These links likely serve as redirects to phishing pages or malware download sites. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://infrive.ru/uplcv?utm_term=the+definition+of+clandestine PDF link annotation
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/eun151fcofb8dfoarpsgg6qpko/dijavobixojisusu.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vkk8c9snqujbu5r6ajngvsobom/xomibuturige.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/238bf7aea619abe1a035bec1d3b40880/68450086419.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/32325780557.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ee5b47e50---53669526550.pdfPDF link annotation
    • http://china-zzld.com/uploadfile/file///2021053000362325.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/toravedimaxewigeb.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772bdee3e80---zakumudirekuniba.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84554b6e2e---sadinuwogusodoxivota.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ih2hri7hi3l6oapigfelgb443i/daponulenaxigifuxob.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16074362400ef5---busagijavunofibedu.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/lobijidoworid.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ngkibed6123fpq46qnfm5to3cl/12669444129.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608059ad7162b---26972582740.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6cc1ad059---20117679840.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/gizijibaxevurapagiti.pdfIn PDF document text
    • http://fitviewer.biz/files/file/63061192803.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/38075680265.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af918da079d---mojigisagetamajato.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/xofupurimediz.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/dawupoluzogetuzezu.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/tomujuxewanarem.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ledepew.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 22060 bytes
SHA-256: aa7f026cd9d4cb0acb55963cabeae1f270b37c12620509478ba715e5d6a4f2a2
font_01_sfnt_off0001477c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477C 10436 bytes
SHA-256: 5aa1eaa940034580468d116c0871cc1da8776bcbf7ab03f6c9f3d53fc9b84482
font_02_sfnt_off00015f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0E 2796 bytes
SHA-256: 80affe34908225dbc6b48508df915351b3a7adfb044b5206ba97bc474e0af69c
font_03_sfnt_off00016acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000182dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182DC 16616 bytes
SHA-256: 64b3b564ae6fd388a7dae9617f4e578b4b5fea77a717a4c1c2b2ee3427750f2a

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