Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f7076ad79def53…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 11:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 165f4bdc70eec1082c324b5c8a0a45c5 SHA-1: 41b2929b1388d04d193e3772eec9f1720fee95e9 SHA-256: 98f7076ad79def53c992f732e1d6bd85dacf7d4485212db151b594582dc8976e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=electromagnetics+for+engineers+solution+manual PDF link annotation
    • https://uudanbury.life/files/file/susimifetug.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/wudejubixeju.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086a11b257e0---sekisatogadibalutev.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/281815352701.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/mobasudabadefena.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d43d88d43---39339361168.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/12363496586.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ehqm110b2tkjbp4gnr609p8p60/dulubonamavoge.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea34bc3ac---fezuvotatibezozatulet.pdfIn PDF document text
    • https://mnlex.it/file/58634631806.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6d3b8afce922cc853b30ad34c7f28639/74837427359.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608138194b2b9---93001728927.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4qsus9qb59hihtbaa0trkcv4k1/96891082915.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/febidapinalekanezanalibun.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/17000854022.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/nixemudoluwukoze.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a6f82aa5d---divigididomolewuxekifej.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/rixekefonuk.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xofuputakidikevinubekexuj.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609121dddaeaf---xozelagikeve.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/xanumepovuvopigep.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/kutaker.pdfIn PDF document text
    • https://krusomying.com/data/file/movanabunafavog.pdfIn PDF document text
    • https://mvservice.it/file/73219373013.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/76556339703.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_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 10760 bytes
SHA-256: cb9572cc1c162eb3eea8d151092a59ae97f7f7eea6d362ad102a3c7598fa5a52
font_02_sfnt_off00010d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 18824 bytes
SHA-256: 3b2ba241a711e1ddb283b12fc532fb67352d87b440d59cd63e4bed4a540287bb

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