Malicious PDF — malware analysis report

Static analysis result for SHA-256 8888bf2253dc2ab5…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 08:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a07551b8b712831a5e5cef0c99204c02 SHA-1: 0ac17e4639bf93194adf6c280aa6c9ba2d8b36d7 SHA-256: 8888bf2253dc2ab54132be748824044f46f3641de392bcb2f51c0ee869513552
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. These links are likely intended for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://allytemp.ru/uplcv?utm_term=what%27s+the+meaning+of+nfc PDF link annotation
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/purawofafokoro.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/pugidowuludo.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/44039089803.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/59324780324.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/zupuporenutowedisa.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3fe041c05d2a94f86a57233a9a6ac5b8/71646200248.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613332c9a6b39---31339404185.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/nepulutudoperofes.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/30935592705.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/56814698832.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/rimufu.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/64628201029.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/66606665852.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/kusefedanolixedomoxagaz.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/47209554614.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/87a45c330ed299270da00b19bfc3155a/23234108512.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/5993938877.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/fosamabimukam.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339a021f9c2---85422549429.pdfIn PDF document text
    • http://autovoda.ru/upload/files/wadexukorokenoz.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/pilirabavolefadefaniluluf.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210907091418.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/pulolusat.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_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 10664 bytes
SHA-256: d68d8c5a9d576f264de030c3e91d5d53181360ed39e7a91aa860b62931a93eca
font_01_sfnt_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE4 18484 bytes
SHA-256: ca2c3c2f1e55d47a201dc8478bc82fc48a0554a49cc6d80299111fa309cabec4

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