Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea2e732bf31bad2…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 07:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a7936ecdb9ac483ec3c3233113736a8 SHA-1: 81870667570550d812ce4c3adb933698a29a895d SHA-256: 6ea2e732bf31bad2a61f5277c724e2edf07be83611112dde8b8851b424a10948
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, with numerous distinct hosts, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bamfieldrental.com/userfiles/file/36945417274.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/m7qkf0jgj2s4dvsel8d90bhev4/50635349710.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c406c5d5376---18223554244.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608517e78596b---sipaluner.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021081210375388940.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/bcbad0f589104fe3c086131bf74872b7/86764396793.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084faf7a065b---50914129228.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/49039541125.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/18683569539.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d50d4d5fcce292bae112c907c5fdb733/punasok.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zelovifugipel.pdfIn PDF document text
    • http://newo.ru/files/files/juferuturotewor.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112122a0c9f1---56439630918.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/98867047135.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-28/20210628134327488231.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c031e3143---lugibelijibotep.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d3c03ba8d4---68423946155.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/banebexowebarodoxofow.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/nofireraxiligoxozibetuse.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ac6085faf1cbb4cc31e8995840329be9/josetovitedoxu.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c695cede3efe5a238e437a832b46b7a5/laxez.pdfIn PDF document text
    • http://hotelsandmartin.cz/files/file/66847883644.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/fbae2020ff67dc95cdb6739594dc2a9e/50915520900.pdfIn PDF document text
    • http://bronia.org/userfiles/file/jeruwe.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c77d7bef2bb3aa622b0fb696948dc97b/13902477199.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/gowubuzire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+big+is+a+foot+by+rolf+myllerPDF link annotation
    • 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_off0000cf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5A 17412 bytes
SHA-256: 6640784259fa722c4892c00bdd620497177deb4c865c9be78f036f0d84aafda8
font_01_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 10784 bytes
SHA-256: 659febb4b871de3a0c5381ff54afe6644cd2b8fb17e1b1bc9fd8afc2a784026b