Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85e0c602d2d4ade…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 00:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f3af2e2ca3a8556a3ed5c48a8be9c72 SHA-1: 8b15955fdf1534166ca313cdd7688af48ce78277 SHA-256: c85e0c602d2d4ade52365e532f070adf0c3cd20a9636f1cfa8201e721ce1a9e9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of malicious content, including a high ML score and ClamAV detection as a phishing trojan. The document also features a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to distribute further payloads or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ketchas.ru/uplcv?utm_term=android+export+call+log+to+excel PDF link annotation
    • http://kxqcgs.net/filespath/files/20210916041356.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/mebixilupe.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/mawewawifinoz.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/vukepadujewewavukevilopaj.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/movasugusebimamuxa.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/msrh0siar4m4uopqfjipl6k6i0/40292151330.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137841c01730---naxawir.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/difexi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0n454nmv7qcpu0de88o9ffpf65/lulirewu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303d60120a2---lafenexowobumoxebotiz.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/48365477081.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/6272568868.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/turizefa.pdfIn PDF document text
    • http://www.pvvc.cz/files/wufakuxofutatarilakepa.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/9590701294.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/97236247613.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/vejeja.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/76071031968.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e09a9e76b---96344012299.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/figinebojipilux.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109161754409834.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/73505175962.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_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 17904 bytes
SHA-256: b83b2d51b40e7e803ed4ba9dd1b7fbab252f359aae0376266a002013b312e91b
font_02_sfnt_off000119a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A0 10604 bytes
SHA-256: 05ee77af593d17426183bcc9de07e46a12177043b899407fb4eb605c309763fe

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