Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39449d920336c2c…

MALICIOUS

PDF

124.5 KB Created: 2021-07-01 19:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e57f92c499676d21e324757aa7bd479b SHA-1: b589eaadd5237b485f6ca53696924d12c049cd99 SHA-256: b39449d920336c2c6523c13eeabb55a0e19ccf9290aedfd21164ae81a9dc9748
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9676

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=gcam+for+note+8+pro+redmi PDF link annotation
    • http://toanlinh.vn/upload/files/33656731589.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/fulafotijopi.pdfIn PDF document text
    • http://absigorta.com/E/file/59368012617.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/p5div6uj6f4o9meevm8v84bmvd/tofokigunosibuxiteg.pdfIn PDF document text
    • http://planbmedia.hufiles/vokozepuzu.pdfIn PDF document text
    • https://faceless.me/userfiles/files/61656207183.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/12419054714.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0baa97ae---3289064242.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wawuto.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/57343061096.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56134629557.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073631c60dd8---81996633058.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b115d4481ac---14093144094.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b3a17c298b2986c495f1033bb3346679/11194707837.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/dukub.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vq5b16l88adpjjm73a5etb5m0b/tobopotukexekimum.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a9ad430f---vimizoturijukojuzebuwuduz.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ff6491a33---bisinijorokekefaja.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a87e9ef3e6695a09520458633b0cd30b/rowalus.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/19028040777.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16086de24c2cc8---vuwotexowobebudakifetor.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/solubino.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/kenasuvugesixu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ac334c514---12234256945.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/189d1fa928476f47b3a8e350c860aafd/14506064575.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/zuwivezomodogafiwof.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 10816 bytes
SHA-256: 47d1742349e82d611439c37eecc2b97b7aae21ed2fe2e0fb60c3c21f974799e0
font_02_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 56952 bytes
SHA-256: c1302c51482145ec0704dbbb071e965e9fbba78854ef95d65292e2f45dd3a542
font_03_sfnt_off0001b6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6C9 17288 bytes
SHA-256: 109da6637f791ce81f57cb8cb452787e946df62f3153d0728cb8953fa7d89a8e

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