Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07dd306640229ba…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 07:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0cbaa89d3d19ccc469f2884405e5862a SHA-1: 51cd3d3077a4ad278d282a147e4c4bb1b7ca7d42 SHA-256: c07dd306640229ba30cbaec621d2a4009dc553b22b79756b5a372713f8018927
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure indicate an attempt to lead users to malicious external content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ketchas.ru/uplcv?utm_term=sandbox+cracked+apk PDF link annotation
    • http://wksx.top/images/userfiles/file/nuvosiruvataxiwizujiram.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/tixewuxumezomexarivo.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/30850101839.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/21687332344.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/sifowiwuxubadux.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137a8c4ec3dd---45951362582.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/vivifurojodexu.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/20083054625.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/97344510386.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/10488010233.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sg8bqf277abdk5gkh0jj6ndo54/sogegiruvo.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/nugorokutafipefuda.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16148d794c6efe---59010151845.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1au0l1gjqcqabk8kaf0iebtm3n/benosadofirodemujo.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/32238742065.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/33676788374.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/gijatuxuxukemubes.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/36937390944.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/gunomivaribonibudunuj.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/58257529844.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/zimevobelowefuzoniripunep.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/2su13000h87ksgr8kudl5pjd2f/62761864591.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/7rjl1m9bmmtbco3q1heh8q7iiu/rujuwaguxumetedito.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/20262284171.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mufoxipusozetige.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 14724 bytes
SHA-256: 9fed4f75a66d5fe13595bb2dcbe16d0d92cc419861c6eb8680517e0e9966ead8
font_02_sfnt_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 10512 bytes
SHA-256: 02a3bbd51d808330fe66d53d73506b1e5e0df37709a8c1d2b0db4e7bf8a1ebc3