Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aededf07cbf178e…

MALICIOUS

PDF

109.7 KB Created: 2021-06-28 20:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9f99a6c5df7fa4b22b02ac127695a3a SHA-1: 7426d256bc06418f80cfc1f520e7284946c49192 SHA-256: 4aededf07cbf178efb4855e3821d41e9e1302a5555a6d0519283713d6e77e534
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to compromised websites, suggesting a phishing or malware distribution campaign. The presence of a 'download button' heuristic further indicates a lure to trick users into downloading malicious content. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest it's designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://philabc.ru/uplcv?utm_term=well+dominated+love+chinese+drama+eng+sub+ep+2 PDF link annotation
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e35091a7a6cfe19d0428b43205ecac7b/mujelawupemikolidubiwu.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/80826692445.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acc8ab8471e---73157390305.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/65268890657.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/95712801491.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160810416eb071---51636951771.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160acd5c969e01---7738323023.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/90319633561.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c7a09653016888e907e4cc06a699f3f0/fikixo.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/zupawelugatirexogorun.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/joxozuzezodaviloxabija.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769439a8431---69187132269.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608689b042101---zamodudimumagevotize.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608545f557c90---51752547126.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10f95c5d9c---rexolaperapududiseduxet.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/r2vvpr4dnfa6vrjfuo0suh9g45/78911917559.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/6410840692.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/12938731414.pdfIn PDF document text
    • http://huntland.hu/upload/file/74671368205.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f32f7b6dc7310d695ce8e2183e0d38a0/wujufu.pdfIn PDF document text
    • http://carszana.com/image/upload/File/6387489734.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/2914852801425a41247c5130af8f323f/26726693535.pdfIn PDF document text
    • https://asi-filter.pl/files/file/32438522851.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d3e3666d7---62564142093.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_off00013f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F21 2232 bytes
SHA-256: 3c1fd90b65a2ee3898a756d6beb422e99e2b37ed9ddc83c5b41a0058f05d7781
font_01_sfnt_off0001490c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490C 16708 bytes
SHA-256: e7d0e485d606034b6de6c28e30ed222cb089db6ceac920830b49e7f3f0e2c6af
font_02_sfnt_off000174b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CC9 11380 bytes
SHA-256: c370f35c13629840314b965f3b58c6123880623be99497d1890b7d9d8dbbc71c