Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f829d4b6f44746…

MALICIOUS

PDF

107.7 KB Created: 2021-09-03 16:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48ae3ba9e103a5b972b0add4a3877d0b SHA-1: 64207d9c7d500339c5316cfbcb7affc19906f2ae SHA-256: 78f829d4b6f44746e1409521f10409ddcb3340645cbae059533ffd342eaca59e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as link farms pointing to potentially compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://hotelbelleepoque.bg/userfiles/file/jovurusis.pdf In PDF document text
    • http://texinpack.com/uploadfile/file///2021081212501289.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/kuguzitutowarifosa.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/91932140386.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/78d71d8e7db2c299a1f4eb03c4eff0f2/vojinogegoles.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaed5b63f2---dovosozujepezav.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/fowokurakofusixaguzajuvix.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610372fd3396f---jetunidelatomirerat.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/22028802568.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/81001381852.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a19d44e7bd7---95541757492.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c795bfcb3ec---jasixabibisikesapikula.pdfIn PDF document text
    • http://vodnik48.ru/content/file/19469489924.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b55c568ff---lolupawok.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160969cf85799f---9395196510.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608589b2e496b---vorigujuroxizafanujimozep.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/5kerkj0taj9so3rbc2ril6uh5i/varisorabiwizukarisepago.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/23514256389.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dfcbb4c157332ee7e0a49ff0e399072f/tezijerudedamijosebe.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/16268299914.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/95956044375.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/34166199061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=multiplying+by+powers+of+10+worksheet+answer+keyPDF 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_off0001391a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391A 11336 bytes
SHA-256: 2e3c8eee46f9faecae9d0f5c1b8e6e348bef1fdd10acc052e3a0aad1a3ad2a14
font_01_sfnt_off0001539f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1539F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB1 20200 bytes
SHA-256: 7b324066f7626cf28653301a1fde1eb93027c6943f76757420a7dccb80a7d1e0

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