Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fef50abbbe04a2…

MALICIOUS

PDF

89.4 KB Created: 2021-07-27 12:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3d196a21cf7d48b8f2eca4ef6f1588d1 SHA-1: c70130b9d08a726803f40957b756c3f6eece367f SHA-256: f6fef50abbbe04a2a7a4f010d8969560116c2e6d0dc2c98f3497569297e2034e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://briarcliff70.com/clients/874901/File/70135675207.pdf In PDF document text
    • http://sibinetweek.ru/userfiles/file/89381774904.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0re0o4dmrj3m62rkl6najaqviu/bojawukobonedoga.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e5357c4f2b37a61d7dc4942e82ab14ab/bovotapufesijebojudovakeg.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/r7c948etr9k6oj44p2v86u5nn3/64214185175.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/ditotibosuwavidudi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b152ddcdfd---wemewotixuwejinu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c15817b24c9---46605450326.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/38501859063.pdfIn PDF document text
    • http://nprofit.hk/userfiles/gafadobi.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/83883309246.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608972a7f0a55---batakurul.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r551r25s597cfah1c85no6etqc/89279858227.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/8aanvivsvf3hrvpl2ue2lpqnbo/tatabokaguvawaxa.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/xubakulasil.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/53872477339.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/74391206879.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/88016949002.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d1fb2383d48364e484a89568288aaa47/59779634216.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/25956536490.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/ea62ee97da2b0f20c5fc1bbe9189e8c3/luwinokekolewufunumuwewu.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/vozosozorilovefazeb.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd4c0ed435---34811015138.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/45352337473.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/sesiwunevamom.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607419ae5a263---40461056768.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8aea9135---junowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+scottish+bagpipe+music+sheetsPDF 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_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 17240 bytes
SHA-256: 223645e9c72170e96ad2ade54d5fd1478784595f0790cf73517210a0592a25ee
font_01_sfnt_off00012644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 10888 bytes
SHA-256: 52fcf9604c2a59fa85c9b69a10468409aa698909bbb017685d6f4b97d61cb4ab
font_02_sfnt_off00013f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1