Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f6d7446ffc57f6…

MALICIOUS

PDF

180.0 KB Created: 2021-07-19 12:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 143fa292b6d70be562e82cb00f96329e SHA-1: 8fc44b51b3c3f450a57c2ac6d9b21f584e1a445b SHA-256: 99f6d7446ffc57f6ab35381b6299238d8d723a4097d5b999eb2ff6813e625915
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing analysis of specific content, but the overall structure and URL findings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://bibliotheque-des-arts.ch/ckfinder/userfiles/files/vusoxasitodajilelubiwawi.pdf In PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/kakejoke.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/1411be6f65c5db031a40888c6b2a06d2/16820067604.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/kaxoripotaburozarevevesa.pdfIn PDF document text
    • https://anfauglir.com/images/file/zenibipudibelatinupi.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d28b2ac734b---7928273164.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44b2df1d95---garulipururesu.pdfIn PDF document text
    • https://wrd13.com/force/file/namujufexirivukuv.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1796e2b711---suvotowe.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/megumibu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7d1a6362f---33330179209.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c5b9426aa2acb9c8fdf23e945d29f7db/78221064850.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2a32beeed9cb747b1f76f660a94aea87/fuditokegeburemepanu.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/gujuluxiwuxalud.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c677a3af16---81563569814.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3316228d9b---giwilikeziwu.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/15/file/20210715_164615_167.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/96626024177.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7b816f612f22ab59630b249ba0c38e82/54452131439.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f79ab605a---60389280532.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/f2d3c5b150f39b694c69b9a6e2a0d395/25729790172.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b8590902f46d645194fe8e0cc06e2616/vojajin.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731033be9b0---53733483973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sware+to+godPDF 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_off000251c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x251C6 32016 bytes
SHA-256: e29572f5afe1393d849d89551cfe2b4248c4061769cf3a08e3f84a0d7e2bff0c
font_01_sfnt_off00029455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002ac6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AC6C 10172 bytes
SHA-256: 2eb5a0cb77b04555573f567a0ac71afa65a70c7ab6f8ea499e37a8111b84b8fb