Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76eb14b7fc785bd…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 11:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 34649d21253974cc37909e0c75fe19ad SHA-1: 3f312040bf52ce69ff9338b10d4858ca9d6f5e46 SHA-256: e76eb14b7fc785bdd481d6e8d990f9cd9a9cdafad9af4938d77eef91a2743208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=play+flash+party+apk PDF link annotation
    • http://phutungtdc.com/upload/files/65788789874.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16153aec656c2e---15773059131.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/2372551973.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/dutetuwadiwenukegime.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ai2am2qc684kfqqtr8s3blfdq3/berosesulekulidajemu.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/34101126911.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614796565a1d5---34936309935.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/11508469299.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/59092924651.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/94234772613.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5g1hoot5giv473ocibjflaiujp/wenoxis.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/fewoniveledomobarara.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/23137688811.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/4301863775.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/31507388076.pdfIn PDF document text
    • http://sayarbobinaj.com/file/kilipejolo.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/jajilikugirebixejomuz.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/xejulamokijosinosujule.pdfIn PDF document text
    • https://chv.vn/userfiles/file/lebesalaloposizazu.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/gebogifar.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/68229191637.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/juxapikusununigozovifusaf.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161378fc0da537---82870686504.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5q727sr3jomlvbod3g0g96cce1/44702923545.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_off0000b27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27A 14404 bytes
SHA-256: 0da40374856183d6d48f6cb4c2fcf24b886b19a5c101f37aac19f2bfdbf646b4
font_01_sfnt_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 10212 bytes
SHA-256: aa8fe557c20b2606457742ec7188952d6bbd9f698f58717aca17ed8c451387e7

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