Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fabce861944d15f…

MALICIOUS

PDF

86.1 KB Created: 2021-09-18 08:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a680b5b9604888faa1ef599f4e50084 SHA-1: 7b4e8adb0151713b667c851cf9f2c6c596161c44 SHA-256: 7fabce861944d15fad690e87a7ba0b74e6dfd0906243f15c9aedd07fea8e5d4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, characteristic of a link farm used for phishing or malware distribution. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://xn--e1aazeoc7d.xn--p1ai/images/shared/file/5615214673.pdf In PDF document text
    • http://on-video.com/movies/movie_data/file/dewumom.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/5782363987.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/52579832382.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/kirekefubiketegaxile.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/45504608912.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/karafin.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/zozovadosebisuduneben.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbe92d025---37921324375.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a26dadb39d7a7faccd45b9f6a0ccbf63/wezidumizowisutosojojowin.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/00f5486324ba293488c3977804671a6d/dedofejazet.pdfIn PDF document text
    • http://castel.lu/userfiles/files/loneduwonewitopaguzisin.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/pilamuvapegagisaka.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210908143716.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/jenujus.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210909101456.pdfIn PDF document text
    • http://furniture83.com/upload/files/xedenar.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/60760539325.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/28341460379.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/75152174693.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/86449430412.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/jirixasozip.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/dunifimosa.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/vojikesa.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/61397445597.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/18099587516.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130667d1cdc6---jakufaribem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=whatsapp+contacts+missing+androidPDF 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_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 18960 bytes
SHA-256: bb3b039f9693298b5205f721076760f6ef4faa5858e989a7fe7549ee14ad7dac
font_02_sfnt_off000131d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D3 10776 bytes
SHA-256: 6f98e825310e72ec130d4d0a3323a24fd71d8b02f7a785284d40dbfe94cffdbd

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