Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3848d1da3190649…

MALICIOUS

PDF

92.6 KB Created: 2021-08-10 17:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fed46b1fcab1bb9559162c47960fcdf SHA-1: 2ebd21b3a42415597b491fb49507d8e13bdb746d SHA-256: f3848d1da3190649a7900f97283be038a93f184a029877488b136fed1bc0784c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading further payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=clash+of+zombies+mod+apk+latest+version PDF link annotation
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4680a274f6f2948e63767c297aa984a7/88955481876.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894abf71045---54623014989.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b98d50d999d65cabd6a4793fd78e2203/ronenezuzixebo.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/73025558913.pdfIn PDF document text
    • https://taperagi.com/contents//files/99633472352.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/jijejum.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e1ce5b574---87683332279.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/82379219009.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/41708390490.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/nutawer.pdfIn PDF document text
    • http://raczcsalad.hu/files/95750308156.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/cb89940ca4d81d7c45111ddd2d91caef/lulagunezi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e7a9b503c---jajabupekotatidupafudawus.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a364e9d4f---wawivugegogebonuxunemaj.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c554ba0f3f3cd16ea606c99d63b58ec6/12486530601.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e15faac0b9---8008934373.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0462b065aa---73980803044.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/57450064837.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/gakuzanavebamoworo.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/74197177167.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b712c549120---33114016196.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 11152 bytes
SHA-256: c8e006e73386eb9942efcfb3227be7353245505ee4e5b45f76dcfc81ee657230
font_01_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 16992 bytes
SHA-256: 9e9535f6b4c20b44d2c1c62860b29c071053f9605c68b5aae0210a6bcd008f4d
font_02_sfnt_off000133a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 16300 bytes
SHA-256: f5ad0d2ef2a839cd33d8d32b480b932513c4a2e18040b46b90826d8e2e05601f
font_03_sfnt_off000149ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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