Malicious PDF — malware analysis report

Static analysis result for SHA-256 1649f6373a774f47…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 01:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5005a3edac7a75248e922b9b852d748c SHA-1: 5f90d9c91bdca9227967dc8df89491618d3cdee5 SHA-256: 1649f6373a774f47b81eaf4ca5584ae828e0f319d08acbe275655b89addd8396
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs, which are part of a link farm designed to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9500

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cructi.ru/uplcv?utm_term=pid+controller+for+motor+speed+and+position PDF link annotation
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/1b354125d68573b8dade1b294979e020/vobis.pdfIn PDF document text
    • https://ijp2.com/contents/files/sozotasodo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5083b5ed---sesusakepuf.pdfIn PDF document text
    • https://invest.pl/userfiles/file/kokivubowijujivewobus.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/dogigijigopujukalozodu.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/85290493552.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32154d5f6a---94896900259.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae16e4d1227---luwokerijuza.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/je75go8pkobj76ntkanblfbmr3/galefapip.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/31775475481.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/7306d639ba9d4cb12e8d8a977006e992/71231670780.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/68513d8fe82bfb04b10c4ba3ed90ae41/26610425614.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f6b5132da---xepiveraz.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16104d87722cde---mavesitoji.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/rinetejoxu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e7a67a3a---51885699902.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/83040071868.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/k2kb9umghdifnrgftcrpahopbd/zanivikunokagazamaja.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/22438360802.pdfIn PDF document text
    • https://rajakedua.com/contents//files/59993310390.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/popizumumivusilebanovep.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afd48547385---80831984607.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/potupenukizuluma.pdfIn 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_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 10780 bytes
SHA-256: 0b8f1f135ee86a2df8ecb497daac8e5cdd0fbd45d50327103fe891ec10699d38
font_01_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 17496 bytes
SHA-256: 0f5260b8dabedc59d7e8e7444085cc6375b17bd62ee8ca0c95cb172adb0d8f6b

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