Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86787fa9ba329a2…

MALICIOUS

PDF

84.3 KB Created: 2021-08-15 04:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 56884b203a97ef33452bcfc9ac20aeb4 SHA-1: b1d1d67157256ef8d91b63f9cc1adbe79c32e856 SHA-256: b86787fa9ba329a296dd03dca6aed166c1596592d714614137d5bbf2fdf841e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggests it leverages compromised CMS upload storage. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware distribution.

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://garglob.ru/uplcv?utm_term=ionic+and+covalent+bonds+lab+answers PDF link annotation
    • http://s8radziejowice-paszkow.pl/userfiles/file/paseru.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/nl4bb7c3qoksdb3li7g9ddde57/49805025885.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/9a55e7c8f07e9c432b2eedc216a3cc85/75853054723.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f626886fa8---dikitodevibolapatavaniri.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/xewazo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791aa157950---39621295571.pdfIn PDF document text
    • https://buka.ru/sadm_files/nuvamunogovebigiduri.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/wuzokonoxobotuzen.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/43959784419.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62394726687.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/keduvatudokuwiri.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/xumibugufodu.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/pevipivuj.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/4153642938.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075036140291---mekatasupiluzem.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/zegumofebodejaren.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c7792c2f---xizufowoxatadulozedemad.pdfIn PDF document text
    • https://onwater.my/uploads/file/mogibifuboruvonivor.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/69486704791.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/35682132916.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878bd19c7de---22572784853.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/kuvonulavufiwa.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pitexepaniwuxeparosem.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/43965085234.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_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 16984 bytes
SHA-256: e9055a5878b15cd9b5fbbcfa81baa0672ba2afe44f6b8e4ae165c45fa125e207
font_01_sfnt_off000110d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E9 10604 bytes
SHA-256: 4fa39a5d4ea7743929d4cff109cfd68fe5ac8284d2348d809a370a8c5599e979

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