Malicious PDF — malware analysis report

Static analysis result for SHA-256 998b1588b2adc084…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 17:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80a4aa40ef548d16d15dfdd9714e080a SHA-1: 37228af35ec141d2be361efb06e964437e551e42 SHA-256: 998b1588b2adc0846b372dbdd64670c9492c627e11ed2a57612bfb380a4c3c34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further compromise. The presence of multiple links on potentially compromised CMS uploads reinforces the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://menu2uplus.com/images/file/xenerezurafu.pdf In PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611dbb1cbcf85---14612613575.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/72960560148.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/76004233460.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/85183868388.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/2a90382a0480e05684b7023fa638eaf7/jopajek.pdfIn PDF document text
    • https://parkettworld.com/upload/files/27018080497.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/wutapusodovof.pdfIn PDF document text
    • http://jkohut.pl/file/93523202731.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/84446849084.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/a2gco70mgu2ll7ara03jmu3n11/besesoguforugoxepevufox.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/visewax.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612cfaa1d55e3---31649915699.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/mexubezemetipitamod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d644717fa0---63246178781.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9cc894c48---17923586075.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021061817071871.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/jatajuwemerojakepopil.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-6/20210706000723850175.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa027ceba---sijekuxidagurijafejo.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/59549347933.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/wuzulomofekisapife.pdfIn PDF document text
    • https://hsse.cl/files/fipubisofivifunazopoz.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/13f6c7b1618e1770a00f5ec650ba8ece/77579342575.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a125b6160---37325159421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cyberpunk+2020+pdf+downloadPDF 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_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 18160 bytes
SHA-256: 4343a17287c4bbe821d311a8c8662bdcf2f6da9b868e096b6e95813bbb6292ee
font_01_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 10936 bytes
SHA-256: 01512c7bc45130641be60a220f701c3088abdabe445f6479a37bcef92bc2fce6