Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d63f1a6840760e9…

MALICIOUS

PDF

93.6 KB Created: 2021-07-31 12:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57113ee14f1a903942b5dfe6c010a629 SHA-1: aedcd8eae06dcd9f0efe5a9612e9596a4aa37061 SHA-256: 6d63f1a6840760e961d4c6d03e3a9211f061592b3f58ce3e8f8db9b96c5c0121
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised CMS upload storage, suggesting it's part of a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://queure.ru/uplcv?utm_term=minecraft+pe+1.16.20+ti%E1%BA%BFng+vi%E1%BB%87t+l%E1%BB%9Bp+1 PDF link annotation
    • http://ural-resyrs.ru/data/file/navalowi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0e371d8a5---zoginesoke.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/38686842810.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/muzosiwe.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/zokulijusabevevudutuxadi.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/xototukupu.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/80285943232.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/36579386315.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9d8b386b5---wadodupiborejovi.pdfIn PDF document text
    • https://webmenuplus.com/images/file/31802076787.pdfIn PDF document text
    • https://samowar.ch/upload/file/31305109961.pdfIn PDF document text
    • http://vinmexindia.com/uploads/bejupabozezix.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097950e2a950---zirozumemotaguwudafodef.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/tavevimimo.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/1bb80b07050f8c4102f907a8cb60078d/4754646949.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafde02854---82797264585.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a4f5b4faf---34519212978.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/0v5a18od5o1vpofd7hmpte3ucr/75387682563.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730bd9192e9---malotemufomov.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/15172599036.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/wijolufedap.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f566f19a5cb---fitamemutov.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/3mij03gbjghc0lqq8231bfusal/31483745082.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_off0000da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 33312 bytes
SHA-256: 7f5dde574291ac12913e52ad9d5cc614d16ac111b80525263bbe2a7f3d50cbda
font_01_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 16844 bytes
SHA-256: d41df48f13dbe19055d62a0b18688dd2926dbdb804b63653cad59c8eeb488bf7
font_02_sfnt_off000132b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B2 11556 bytes
SHA-256: f9d57da92aab97649d5526ff4aff3fbab4b539109f6ced2da6009b9f8cd1c89e
font_03_sfnt_off00014dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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