Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0717f91d6d7e344…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 18:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b78036ac77b90f07ba4a432594c3cb42 SHA-1: d7345fbfb59b395a0d9e991d02760792142c0e25 SHA-256: c0717f91d6d7e3448b577ec3a522d18a5ae2c4991db88720910434260e37c896
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and a deceptive 'download' button, indicating an attempt to trick users into downloading further malicious content. The presence of embedded URLs and the nature of the heuristics suggest it is part of a phishing campaign, likely using a PDF exploit to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=word+building+worksheets+for+kindergarten PDF link annotation
    • http://sasnowosielski.com/ckfinder/userfiles/files/96366969653.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160abda9c93d22---bipefokukowumiza.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90e75ed2de---fuvagapidirokij.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/8182582edfee26de4024f180a6c9dfba/guvidiwatulipavoxekoxele.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/74755313027.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/leditokikipumi.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/tasovuwapemogemisorokalu.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/43680486125.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/pomizeg.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/lorelabup.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/xelarubakirada.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/fopeg.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/98172194845.pdfIn PDF document text
    • http://jarosi.hu/files/file/7622914264.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/4426271779.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/rubopedesixarajura.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f113f05f4---30059516522.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/47377702325.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/913e7a5b2786278d93118b2c69ad5b0a/54427276371.pdfIn PDF document text
    • http://fitviewer.de/files/file/22821610480.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/90282283727.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160832a0c9fb88---99219258760.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/krl3snd2gefmk1g0m1qgthb267/fipufatab.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_off0000c845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 17784 bytes
SHA-256: cd0c359e29508d2dca1c6edfcc06e57ea8b3b2f2a142326b81e9f18526dbed15
font_02_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 11044 bytes
SHA-256: 6d7a6a3a4b9420364551969eeeda255a2b6e58d377ac149f5940843319670b98

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