Malicious PDF — malware analysis report

Static analysis result for SHA-256 3252bd022c3c15e6…

MALICIOUS

PDF

85.5 KB Created: 2021-08-24 17:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3af14accc7d7beeacd1b3a25874ab68e SHA-1: 69e1f31e71baa5ad5d9f7033755e77413d5b01ce SHA-256: 3252bd022c3c15e6e52d4295e58d57a116e32d8e08aaa2cd02cb46348526ae96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely 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 0.9990

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://infrive.ru/uplcv?utm_term=centrosome+present+in+plant+cell PDF link annotation
    • https://vokalensemble-vocembalo.ch/userfiles/file/28024157306.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/76428122808.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/zinumamuzukugobedimone.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/47941313683.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/17450062117.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1lg34lfl67d3t0q8caqfocm91k/67356212506.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab142d7bc1f---282796133.pdfIn PDF document text
    • https://mmszke.hu/files/file/52861778688.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/galokavok.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a8d00bb6b---likuxiwunumives.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/bibeleviwofolafun.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/79393273903.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/33aae52c683463885f658c3d1bf9a0ea/pisududiwanuzuzosugefejo.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/jrihp4m4nko245e4t5m3uo44kg/pobotu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085ccc60fcbe---tigopanoniguxuz.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/feguxakafu.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/c09f5dcm71mldpb9slmu8uvtao/36569091383.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/75e2e7bdb22ed3cf8279dd079c397655/68738335868.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c52d9b88b34---puxuzubumusapurado.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/daxolulunutirobuk.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/1d42d1deb0e489528f9aab333cb8bb45/86558806869.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jgr3689j8u9lid119t8tpb6254/88809375666.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/ef7f429403c2583abf0f39d4ba904768/woxube.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/regovewalatuxelodug.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/38548419529.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_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 10564 bytes
SHA-256: 3b7ebe4ac98c358f15697a47cd9b240b0a05e2551f5ef568623ccd508eeb29c9
font_01_sfnt_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 17728 bytes
SHA-256: c165825388da15812950bbfc98b26501f22686aa2589e453b38d8b58c76f2b6d
font_02_sfnt_off00012f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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