Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8bdf2f3a830877…

MALICIOUS

PDF

133.4 KB Created: 2021-09-01 10:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 553a9bee83b398463108fff88c1b1100 SHA-1: 23a5795b56f33f590b9837c32d188a333c83d262 SHA-256: 8b8bdf2f3a8308771b0e9e738fc429d701a78a58df1f312417411e1f12398ba6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to lure users into potentially harmful content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=i+have+not+supplied+proof+under+the+doctrine+of+estoppel PDF link annotation
    • https://petek.biz/resimler/files/junulakosugikuxozasib.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf636978843---popuxafomin.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9444dd2df26d9aafe8d35a69994969a0/93010174516.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/54554661945.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/56123498381.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/07361e67dc777b52081baaef7eee37c4/79017396044.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/6653962763.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d93d8986ac---bodopuwefibinurosalorusur.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7040d34622029b9a3364be397947c2b2/lenumovuv.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/dijiw.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2bf801a43---1518839796.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/xiliniserifuwig.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/muwugoludajodafusobup.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/kipowova.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f3d02432---nofisezanirunenosed.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907b7720c82---67307181447.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/retudulametuwinod.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087d07904b5f---bubibilugoriteraxo.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/gopir.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/97940503876.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/83820932661.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/jagokek.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/8fvftccptmav9a4n2ajff027pc/4224500128.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078b1ff4ca30---pupituz.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_off0001a569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD80 10832 bytes
SHA-256: b42e4319e3d134971f7896687152faa1546a3578bcc3c1331d379b47d9a4b7af
font_02_sfnt_off0001d671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D671 18312 bytes
SHA-256: b2e13786acb92a9c8277f76edbd67470ea0386c211ac94f542a2bd881b6fe6df