Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e441737b0bbc8ca…

MALICIOUS

PDF

74.0 KB Created: 2021-06-26 14:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d4dc5bce324c2a4de25b28a2046b11f4 SHA-1: 61a982de86e291a1a231ddff0456090956bb04be SHA-256: 2e441737b0bbc8ca54c87b9a966352cc55ebcc319a3e14d917ee99e12db1be96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=the+following+day PDF link annotation
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082c34e3a39a---dozujo.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8fckg4bnt0n98o6hbhfebq4pc2/84616397791.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854aeb6860f---fugimodijozil.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/74981793442.pdfIn PDF document text
    • http://fitviewer.de/files/file/nalerowomujatatagasasesi.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160966bd390a3f---89904654218.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c2a8bd3b548ceda3e22ae27ae7d4eed8/kesazetaj.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/34478036152.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/29603115388.pdfIn PDF document text
    • http://momsystem.ru/public/file/detirafowotifovelexukili.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/rikatudatutokubefutul.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/84013295800.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cd7a4a0f90844868ac6b4a501def09bc/73670003378.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/sopanoxageb.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b010d036785---tiritegexajasutumugizop.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/70c2dc252cfbe7af6103052e0bdf317e/37643650089.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8d8555ae---tebigado.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9e8c5045f---70239293742.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/90624203899.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/pukawuz.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608713fc13cd7---33121004238.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/06dfcaafba377dc909b66d6301f16fa7/45085073412.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df895dd0f0---rizajutuv.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5cb98fac83d5106d1df546a8b40200fd/39130172757.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106081804075729.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_off0000c231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC231 10428 bytes
SHA-256: 30f98236daed38167d38798e7d67c915fdaaef73d6e39b51fc7a6e0361bb10d5
font_01_sfnt_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 16388 bytes
SHA-256: 373c61a3b01e843fead1caa86c023fc61dbea0bce7f9e3f56f644e328134579d
font_02_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1