Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58b3e9913ae0124…

MALICIOUS

PDF

77.4 KB Created: 2021-08-10 07:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e89e7e5cf638e1cc88d310debaf650ca SHA-1: 34972214365f0428f3e55c575df7fc6ea6b8542a SHA-256: a58b3e9913ae012457d342996a8d0a855f451f41535178f7092e60a236abe2f1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://smidgel.ru/uplcv?utm_term=best+mods+for+ark+pc PDF link annotation
    • http://k-souz.com/userfiles/file/68403145113.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/o39s9obk74othtfj7c9sstgvro/nupigaber.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/vorepabivebixojuxufobefub.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b53900d5addf89ca20b1aea338204494/24533454452.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/76723665290.pdfIn PDF document text
    • https://quizai.com/uploads/files/30525354976.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/diwemuvutulorabis.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b7b8817dcfb4c078e6e6cf96d38b0a83/piwirufekaxufeneteti.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/v0hgcapd317a9sevu1hcvktuad/nizijivodivex.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/levalikipupikaxebexeza.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/bometowepakiruwupuvuvalil.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/84608036551.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/90484670901.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/nusovuveru.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71227780011.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/bixitobavamag.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/89800316191.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ae7de1164d730edcbf1818d7f7990aa2/roxodupatofijukagerofasik.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/pb76lfvil9p7cin0b8t8s75rs7/mifusojer.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/85686316084.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/ad126e75bb1508c297a176489f66afbd/8707744450.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/3ee691a110b91fc0eb9c8941acf2b29d/purarasefek.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085a80f8281e---41803621627.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/pson167eoa97ui6a49rc06pilh/57864075256.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fb2b3b01b4efee7c8083e5a2d724bf72/42206429581.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/64etabtejsv4dfmifoht64tvv7/votejaz.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/6928f0adc37d0091d0ba44a7f3d235af/fopobane.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_off0000ce68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE68 15884 bytes
SHA-256: a868fab2035bab0b4e99ab69355814388b0389183717387e9e269a1670af5aed
font_01_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 10684 bytes
SHA-256: b401c2d6cccdd4da0f5427a4d859fe94574ca3d00cffdcfa6866398e7777d782

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