Malicious PDF — malware analysis report

Static analysis result for SHA-256 7583431edaf2d98f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 21:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 44e3fc8aab827cb4b16f99ffb3972996 SHA-1: da4d0ac63410be0377936e70a5ebaea5528adfbd SHA-256: 7583431edaf2d98f849d475470dadf2fc3a26199795e9a38a5801866df4bb648
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external URLs, many of which are hosted on compromised WordPress sites and utilize disposable domains. These links are designed to serve as a link farm, likely directing users to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://cructi.ru/uplcv?utm_term=nucleosynthesis+worksheet+answer+key PDF link annotation
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/80614803990.pdfIn PDF document text
    • http://beiks.info/public/file/gonanuzozibox.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086967e95515---sewemizanurowipudodalotu.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/betivuduzumagumunaweviju.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/52efea1341dbee8f7f14ac20f2d4c4a3/wetizimefefo.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/lawulamudivitafukotobom.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/5140933487.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/14b201d7497aa11e060dc4f22c91e8dd/vekanobosa.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/1e65440c20e6cb1b029a92e4e5baaf78/rabepileze.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/65615646941.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2988439cb2---zetuwupubomejup.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d4c3d3740---6237570466.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/gugakonelu.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/96792651795.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/15001980772.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/sufuwazexi.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/mojawazuzopupubifexip.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430104332749064.pdfIn PDF document text
    • http://cwesp.biz/upload/file/357592920.pdfIn PDF document text
    • https://efnnma.org/files/file/36965508970.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/k0kpnomb4katac18d78ccat2af/94939234741.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/f4c0d175191c66ac2deabfb91b71562f/95910678840.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/xaguxinetabiwaxuderora.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/tuvakidakojo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b5aade52233e9cf9a1eef1d692040327/tamirifanit.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/kudupelibivafikujaxowiwoj.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/38234652039.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_off0000c7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A1 15708 bytes
SHA-256: 6a83c671b4bcc3e1a43b111fa24cb01d7f5242e254be426517aff396406ec9ed
font_01_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 10696 bytes
SHA-256: a9a00f4436030ad3fe0f09c0e130edc39ca4efd128ac90f8f4fa97d7cb8ee5b3

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