Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf50de985dca3f8…

MALICIOUS

PDF

81.9 KB Created: 2021-07-13 18:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7e66b442e6f1882a5bc25fddb545ca0e SHA-1: 38d2e0383ea0da85595d320e8df24aac2cebcf78 SHA-256: 0bf50de985dca3f8e6abc89f93d803c7aed60399b9c9ae9d219cef6127d37c5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The file appears to be a link farm designed to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/8ir5b36jp0so517oe5r1ckbdh0/6558053180.pdf In PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/ruwokikoxetuw.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/63879077922.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/voa0u8nt8mta010nf1s2r5mjl7/gebapanelufusapuwoxosu.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/nanafazuzu.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7qins1rv0dg7otkvqfuhcd7ji2/mukuvukakewefipovizez.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/12176083913.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/misetulibetonejusuniwibum.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34b22c5e0---mugusixilewovot.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/damupepalipevejuviwexoseg.pdfIn PDF document text
    • http://accronline.com/userfiles/file/napalozexesi.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/b4a381f76892eef78013fcb80b162cac/15660358345.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/15058015992.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa33abbbfe---89448721925.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbbb8ffac---10448986113.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/46574009771.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/06oo6aqvaf5eg6diq28m7lb6pj/dosukitagunoxobepijew.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/885e529e30c4b85ede2329783cbc1d58/50291020029.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/13906425622.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd762673f---23786881428.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/3767759831.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/tapujotisisatipal.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/49548867669.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83da9f9ee---dutakomajezoled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=maze+runner+1+full+movie+download+in+english+480pPDF 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_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 11612 bytes
SHA-256: e403d50292f28f8c45684a568c10a8a4db4f4812dfd1a0b8f00a52484466e562
font_01_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 17016 bytes
SHA-256: 5abc7037722bb18069e92cda90cbab1512f42cd25395bfbc2b2db1c89bfe2f26
font_02_sfnt_off000121a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1