Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20d9aaf55853450…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 16:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dabc2416679752d8c8351bfb4a620b3e SHA-1: a5a09e6b51293cd449d4c71f65934dfe78abf697 SHA-256: d20d9aaf558534507ee68ece16cec99cc7bfeb6c405217a146d45e045be6c3bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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 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://xn--dlek-5qa.com/admin/UserFiles/file/lekadivubenatixugiw.pdf In PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/32132207046.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/pamejumexuwinoru.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071240579a99---gifilumurovuruzojik.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f4263ceea37---pagiviwidewowixafe.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161134766d3754---fibizababidadox.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/28357733338.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/f74f3b5c81d8d79cb98054d0edea1c8c/405295789.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/cb80949fb89ebc823f4dbc12bef1197a/53551674318.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/26253851409.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/48543323165.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a542473abf0df8239116cd0f9759b708/27530074539.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/patopifugekebiwe.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e13a603169c---73695747052.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/tiziwixaladagaparugikavon.pdfIn PDF document text
    • https://noddy.nu/images/file/54835251494.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/03535cac7d47609df90117dfcb309422/dawow.pdfIn PDF document text
    • https://banghenails.com/upload/file/xusogupupi.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/loxejifoga.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/10634455047.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mvnsok04h1rp2soomg6kurauco/19871371221.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/paxukeferozusevepodajaIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dosage+de+la+cr%C3%A9atinine+sanguine+pdfPDF 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_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 20584 bytes
SHA-256: 3b768a6ad08a6ba231639ae0a02873599830fcf24db7c53d316c914ac43895dc
font_01_sfnt_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C1 11048 bytes
SHA-256: 6d8898a3b534c614dece5f18ff17318b1c87e19aec9bc603782b6329cf98b8f6

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