Malicious PDF — malware analysis report

Static analysis result for SHA-256 f185abc87e019289…

MALICIOUS

PDF

88.4 KB Created: 2021-08-13 13:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9852829cc15169e242f2e0aec5f58468 SHA-1: 074282ea7cf93a20722a40a2bfa6419540afabc6 SHA-256: f185abc87e019289115fa07ae67cb0b690fc08d0543fe9d687195e3e9cf2ad55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the overall structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/bonusodesonisivugiwasem.pdf In PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/31395574633.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075457d0eded---71367627485.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/63545517635.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/0d97n9269v6ccu3c779kd70lts/50640477007.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/5af25793565650ec681e20678a4e1a4a/40021544336.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b858619e73d---viguxefej.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/f030ede9c063089888cdf4ebe582b7fa/suzilebudixi.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/93507291846.pdfIn PDF document text
    • https://digireg.se/upload/jawegof.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/nojaxinereje.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4189a9bb407583491e39a43bad812c71/xuvimevipegugesavanamagol.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaab8845b5---88832396315.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a83fbd62dfddf7e81b3a0a33bf3787a6/16475182929.pdfIn PDF document text
    • https://senfina.top/uploads/files/84241888663.pdfIn PDF document text
    • http://sartor.ru/upload/files/sezanido.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202108080736558075.pdfIn PDF document text
    • https://tusenfotingen.nu/anvandarbilder/108/files/bagiwulululitapelabi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d312e068d---gobesisux.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/88419307250.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16092472adbf9e---xoxowufosifirukek.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/41636086144.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/82887115317.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/7490f8361ef953e8de266875ba7e0687/34893702040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dawn+of+the+planet+full+movie+download+in+tamilyogiPDF 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_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 11044 bytes
SHA-256: f398c8f9b041b0692b1ba39541a94e007501dc1ce844825fa276c123255c7a8c
font_01_sfnt_off00010e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12645 17000 bytes
SHA-256: e2842b9dad86b507c7433483530c434436bbea01c15723b2aaca89c6b18d26e6