Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a2ec66453197c9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 15:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c47987a3063e516c3a3a53bba83004dd SHA-1: d0327eed292bdad3394bf3673a78fd00d72fc52f SHA-256: 57a2ec66453197c966a4e4b8bb5580b62e69554a4edc7141002ecd92afa32c62
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://snft.ro/media/file/lakokazu.pdf In PDF document text
    • https://grandplaza.bg/uploads/assets/file/51881570533.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133b89b172f5---gitozukasotedezubibi.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/romol.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/lixajasaduduxetikugiwudi.pdfIn PDF document text
    • http://unsersohn.com/images/file/92685042098.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8cc21ed73ba832f97874df517cff3051/tiguraduderodogunuk.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/gitawesegegukubugovesav.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/49398890539.pdfIn PDF document text
    • http://secretinvitation.net/images/files/ritowukotamutexokodikez.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/tivanu.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/14346840424.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/58976625404.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/joliwubasolokexewu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2c625b3b0---gipuxudupekopixipid.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/julinekupimob.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b69797de5d925f2b3509bb0fb870c01a/37843433877.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613172052e450---kejuletilad.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/41960371440.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/lonisodagibemewa.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/nakudixezelaju.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/89484001399.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/97647133114.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/muxetizez.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/97094078224.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/jemizoro.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1593d3a9fb860890b5aa199fa4d3091a/27924614414.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/26629864770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=remove+snapchat+filtersPDF 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_off0000ddd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD8 10856 bytes
SHA-256: 014318e7ee61108f589a8f7daecbbc91e9575a8d37bed01702282494c51c9cc7
font_01_sfnt_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 17940 bytes
SHA-256: e475d0580939bdee98b45212b27f29f905efffbb89289bb6cc4bb29fa6603c98
font_02_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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