Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9b47293eaad2e4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 03:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8af4ddffc02858c910c9d8b353188610 SHA-1: 388fe32d9a77954bc7237298966144e4ebe04a11 SHA-256: 6d9b47293eaad2e49ce4a9f79557365ff1126b3bb75a373a0ad9d8d25c7970e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to lure users into downloading further malicious content or providing sensitive information. 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 0.9977

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=why+is+transformational+generative+grammar+so+called+pdf PDF link annotation
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/mapiris.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098dd0260a54---37521640142.pdfIn PDF document text
    • http://bjjiffy.com/upload/zakewuzodurife.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/xipiwigubexinexiw.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7e2227102---xabuxaxepopa.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/ponepito.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/10f48665fd3cf30209ca7c62505bf112/bikodetarinogazubovexi.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/5700015151.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612953cc66ac7---bidogabaximare.pdfIn PDF document text
    • https://semut73.com/contents/files/zedogenoxozexone.pdfIn PDF document text
    • https://ip-pharma.net/data/files/80340714347.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/raxogigevenuled.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607284b7ae2af---43345446755.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab25c9b954---44582869565.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c19bc4cb629---78841637241.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/5db560df50e7857dd4e46b1d1fcdbc04/11773643571.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/nebugirobaxe.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/52156499490.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/8464861624.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c36479ef710---jifolurawefuxizi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b508ddf881---turokopixujeruropedot.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe6b7dd4e6---65571844012.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161033fd25b719---43870002168.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_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 17756 bytes
SHA-256: 0d22cbb46479d21d769bb3deab27489b0bce8f281066fc9dcf28924522af2a13
font_01_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 11240 bytes
SHA-256: 7315836ad3814b47acda3e3131e0f1b7d07bf9150cffc1a3a544adcfea279d6b
font_02_sfnt_off00011cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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