Malicious PDF — malware analysis report

Static analysis result for SHA-256 03354c5263750434…

MALICIOUS

PDF

85.4 KB Created: 2021-08-31 00:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2452b74f6ba4b5430edaf1440b69d585 SHA-1: 1ecc4498180779cc0f17ea48389503c8c12c4371 SHA-256: 03354c5263750434eb9f2e9c10839c0fe29949ade451afa8224f16be5acab6b1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs hosted on potentially compromised or disposable domains. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=infant+chest+compressions PDF link annotation
    • http://vencedor.coop/images/admin/file/35408260185.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/30035409783.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/daperogi.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/35415559843.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/feratideb.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/64166540499.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c78743b8abf872bd665bba93e24be48b/10702144604.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/jmbcciqv3t8vrb4l8talofdn9c/44546779357.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/82859412746.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/g08fi7bpod69l94nkhml8gt8j6/60595306827.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64fdf9f9d2---gowivetejebakidegi.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/c845a235a925764e19ed6241c1162786/75645123566.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161073167e8dbd---vogudigebejefu.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/99qcmb5jfasep0elkn1ccsr34s/86793124585.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/raradexuwawumoxakanunad.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/deliku.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc882754af4---mokuvabefedufanusire.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2afa530e---safed.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/fifijawadabixaji.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/68833331278.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/kuluwogesa.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b782f5bb1c3---gokafekozimabiwamagotor.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8a7c34dc5---56373105034.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b48eed54a3---98591319417.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609430680a072---80083603136.pdfIn PDF document text
    • http://klinok-saintp.ru/files/mikezebise.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_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 10652 bytes
SHA-256: 2511aea72f32b275ad2a6550513e40afc8cba5b020af8674722731024103047d
font_01_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 17188 bytes
SHA-256: 260a1bec16aa22dc697e9a53fa7584aa38393f565436a9fed12c29f014298205
font_02_sfnt_off00012f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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