Malicious PDF — malware analysis report

Static analysis result for SHA-256 17281367e925a281…

MALICIOUS

PDF

84.7 KB Created: 2021-06-13 15:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e42fe0fcfbfef55fcef25b3f72eaf8fb SHA-1: d27e51ff818863f0c98413c2f80ebbc7e748644c SHA-256: 17281367e925a281113a46971107335d7efe88a48887ca9aebbfb11c92775dac
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and disposable hosting, disguised as a free music download. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to free downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/uplcv?utm_term=let+her+go+jasmine+thompson+mp3+free+download+skull PDF link annotation
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/gngp26chrv8lg6vuq6p84j2sab/6623908729.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/ranovezebuvet.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/40614f66755ec8808c0075244bbe346d/22702076213.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/61686057290.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c028fe59f72---5299354903.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/819e5e1718c5749fff6f9e8ec6bbecd6/ligalopeserawixovitoxol.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42455796f---23883223913.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9ba93b167---84902552599.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/guwixanufirojeworu.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af62f25855a---49504556524.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/85a89e64bb4f45add2f73dee18d44154/73942612422.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76ccc6ba14---wisinonajatirasipur.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb415c43dfe---23115993820.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed79c65921---mavenijulojaxupefo.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210613_D847C6DF22EEC5B3.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c2876a5051d---41143328580.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012954.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12954 17892 bytes
SHA-256: 75837d26444fc856fc128e1a1f0d01f0ffbe0789e75108992685fecaae21561f
font_00_sfnt_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 2960 bytes
SHA-256: 7e4e5a7ea4e47e7575140ee2ff0053771655f57fe92b32c2cd7c223df26e3fe2
font_01_sfnt_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 5792 bytes
SHA-256: 524f85d2e1c9368b01c952befbc485fb2290290169fc887379677c126053ec52
font_02_sfnt_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 11632 bytes
SHA-256: 912f6d77e72b264a72232c0085d0f73478d862fa88fb1173c38cab1bfa45c264

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