Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac82981e0901946…

MALICIOUS

PDF

182.1 KB Created: 2021-06-10 01:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 10ff0ed98ecaabc21345ce88b1ea7817 SHA-1: 7e4aa2d00cec7767c57733160b826d39ab437dd0 SHA-256: aac82981e090194611ab5ddbeedaf31db613d669599a116a3b1fbeb0a5362a04
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to downloading MP3s, which could be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=sad+type+beat+2019+break+up+download+mp3 PDF link annotation
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c0d848655de2c238b7ef2757945ebea2/weparatas.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f8f1f6f9---rikopira.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070125ac03f0---27051801498.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2ad2cbf3---mipitowonitaniza.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609558805a57f---kisowo.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/66098763261.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085d866723ed---limowulopeginosute.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jfi8vu8omsfl7pq6vaujivq4ev/98004974408.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/8947654091.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607effad8c788---26570282822.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tcovta2q0838bgu2qal4ekvnj2/jedamugisubakalir.pdfIn PDF document text
    • http://dijitalsanat.link/upload/files/56525674078.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee08da8060---basibofosalagafowe.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1387b54388---mawuwujop.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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24551 6072 bytes
SHA-256: 489c87f278b53dd3c11be01b6d6c8e34a8d42283871eb725bf56f1557d39075f
font_01_sfnt_off000259f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x259F8 4164 bytes
SHA-256: 1b01d184a7557fe4c7e0f5305f26aa4aff662c97db56cd4c244533563df9313c
font_02_sfnt_off000266f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x266F3 4296 bytes
SHA-256: b823accda7f5d15592b253d8915955573cc79b7251df117ef3c18078f9d3ba87
font_03_sfnt_off000277a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x277A5 15000 bytes
SHA-256: 7f3f53bc64ae01e1638fab9ac5207b1aff31fb76321a0a7582b3414367fa0f2e
font_04_sfnt_off0002a616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A616 20244 bytes
SHA-256: fc8120b370467ef436477e3aa0987daef6dacf6730ca276da8291f0d3605c55a

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