Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c70531e6e84d9f6…

MALICIOUS

PDF

102.5 KB Created: 2021-08-05 04:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f4810945f0a915132c6151189b984df SHA-1: 8a33f5fc6813f29559937d7b274de6c123a5eeb0 SHA-256: 4c70531e6e84d9f6b44c12f7f6a650c58a2ff1d889392161ce3bbcb98dbcbd69
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=barcelona+vs+real+madrid+2020+score PDF link annotation
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/47e33abea1168905edca737850e306a1/dumix.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7b448748145fc70a9d975059f34bac17/xawek.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/af04i6fbnm0de9q3bh07uvd6s2/vewadelebowisi.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/kv893n5or127mrddl73lmhs7gr/51815627891.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/95117368894.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/e5uresedsd71fc1k6eimfm8gu1/koramaxusojupimelus.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/9050092891.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d629d24ab33---83535795806.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/958b85837e7fa59fc9d01f6afd6e6a04/fukelozufugowuxaletoju.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/91196949545.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5872650e57---39195527359.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/9pjv49linjvk0etpodubtfqh71/goguzulojedezibadonu.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/70573925127.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/13380758358.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/nafobomifasi.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/2159563401.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/54886198504.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b879afbef3d---54559598556.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddfdd1c2b5---kuponugu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/aebsabaoa4l47l59u00clq0tfs/narusakijekareje.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce7e21a04b---65966881856.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/372967105bfd2438ded034da64c0e0a8/mopijuvaropevujuvuw.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/nijesadinolusozetoxi.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/7535264412.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_off00012a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001425b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425B 10792 bytes
SHA-256: 2bd8182141fa4f01fb8bae29a12355ec3a9418e02b0af619a3f426aed6228b35
font_02_sfnt_off00015b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B38 18276 bytes
SHA-256: ef0993e6dd6119672415459d4cf836a359f8a41c6a38f760d5dbaecc9e2a1bb3

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