Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f14f3be15e79b2…

MALICIOUS

PDF

88.2 KB Created: 2021-07-18 08:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1df8bc3d819a5c34ef2cd28ff9c7ee93 SHA-1: 5bf71abac327de82511b51dc79700050958cc708 SHA-256: 16f14f3be15e79b25ea3f9c0167889d21ae915de3abb324deb6d35909cb435f2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and link farm heuristics strongly indicates a malicious intent to redirect users to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16071043261f0e---81421046165.pdf In PDF document text
    • http://popnmusic.fr/userfiles/file/63037450309.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad46ff5f268---raramodakexavulez.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6fb54f38c73612e3dedb42fbfda0d462/sujezobezanawowurot.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/midowiwesu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/26e337c04078d8b358d79f23b1eb3ddf/79328351653.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160704f396af25---kufonesadamagurupe.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/ec2888c73885bc33ca9aae94e75b24c3/85192623580.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/zodokefegasofuj.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/24875576884.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/98892836104.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/zovojodi.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/36540998657.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/rifuxuloz.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4921b0b62---80149143192.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/91807292749.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/gbth8rh56ofdeu621aiqom33j3/79474445231.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/julakugexatasozevudijeji.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/rafadekuzozuniv.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/mufezorexeken.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/50337813618.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a25da3ee173---totemadajubav.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2317182d0---54680122905.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08d463d884---peziwupore.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/muburapavomiwakex.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/malebotujodufuzogu.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/35603161190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=football+manager+2020+apk+real+playersPDF 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_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 16672 bytes
SHA-256: 7291ce94a64e75a24e86c3ce3c806cf91de85450652db65a6df04f0e170369bd
font_02_sfnt_off000139b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B1 11068 bytes
SHA-256: be7f10407bb809340e64777a26e627a3df20c879bcc0747a154d06125b233e21