Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cdab33271c1bb5…

MALICIOUS

PDF

84.4 KB Created: 2021-08-29 04:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b510df36e068794574e501fcf9c9b306 SHA-1: 64ee773a26fa15c938106cc5c25a2202046b10d5 SHA-256: b6cdab33271c1bb57c25a64fda127093f6239c31d2dee3fc1cd5073682f6cc5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alternativecarrepair.com/userfiles/file/rekokatuliganu.pdf In PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2dd4a3187fcd96ff941e2f5bf64e3fa4/52823090753.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/lozedimoviwekogubisu.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3910fddc0a---tomobumimeloleruru.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/2611461680.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a921ec2c15---69942277727.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/43954342187.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0s4mle3iqij90a3f8kd5ubo2gk/pusegugifez.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/tvlo36ipaaqk01sciecbvpnss7/59554804686.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/45940383582.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/46853950773.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/wugodizonefuxeselokegepuz.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160750219e7e39---gesibilesax.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/wojudirikirekawedune.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9d0d25534a52ba5cafa7e3918392eb51/wegagemutaz.pdfIn PDF document text
    • http://df-foundry.net/d/files/26503475338.pdfIn PDF document text
    • https://chpcentre.com/files/file/fidalevarem.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/39679604886.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/nokovazewasebedatesuk.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4b6d5e3f1---defumexarevu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/n18dlc8odo6qmd0vsmr4s6gt4d/kixomigozezipumidatuvino.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/kenofibozimogojuranedom.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/difelu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f6cfdcb65---punonifodebitenokewexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=online+book+reading+free+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_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 17660 bytes
SHA-256: 986255dfbd5c15854462ff1dc7a792eeedd472df482c96e01166d2aec1bc9b28
font_01_sfnt_off00011263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 10664 bytes
SHA-256: 4938c1e2d6a4d5cbeed47aea04ee7ea1c369430815374e6bbd78e219dcba3a0c
font_02_sfnt_off00012a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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