Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a512f955d577ea…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 07:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1271cb9e14f754b63b7debdac41acf9 SHA-1: 54d42dbaaa4a36b75c941128d354399df2c51b30 SHA-256: f6a512f955d577eaea0daafcb7b01e9d92125b86670027d7f9e9a606ad71df9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. The embedded JavaScript likely facilitates the redirection to these malicious URLs, aiming to deliver phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=sainsburys+microwave+oven+manual PDF link annotation
    • https://actorconseil.com/files/file/vamiwirituk.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/vg9d4f26j27u6a1fto2599qm31/zoritinujazaxuwarapemibi.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/32ae1fcb43fcd2f0aa0b9e9a853aabf0/gepizidajetutumopojifaf.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6fc11a29326b57cd6f98c1f265bf3893/gemutixowixow.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/24820619190.pdfIn PDF document text
    • http://rafaelokazakov.com/file/54004537890.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0g6i82e1kam87ikiiolkapf2au/28734490884.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/pajamaredizuniwiv.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/pefobobobosobaxaji.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5967a0a63---73306685754.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a02d1bd8b85---vewetawugakunibizedaloge.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6636b1f71c9ca1a30e51336df653d12f/36520925275.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/71784700020.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210825091337.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/94219509287.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/zibana.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/jedison.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/balutezoravoxu.pdfIn PDF document text
    • http://snft.ro/media/file/gupixomunedet.pdfIn PDF document text
    • http://446888.top/userfiles/file/jotoruvotolopidorelavole.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_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 17504 bytes
SHA-256: ad76ef7fd8b5a47b15e152892fb3422324ad106de3db6ac8b380b669fcdc5f5e
font_01_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 10876 bytes
SHA-256: c7c8e6cc709c0a5a1f7a8c2077eec278d1687ee7dbdbf75023829ae9ae07ab7d
font_02_sfnt_off00012ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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