Malicious PDF — malware analysis report

Static analysis result for SHA-256 c115ce24dd975b34…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 15:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8bda4e40ee561c6660b8bf9cf98096b6 SHA-1: 439062225ece48ca4fe86e3f62f619962d908b9e SHA-256: c115ce24dd975b34a83bd9842cb70ed71ce1472cc88fdba1574425a29f38c5a2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=malayalam+movie+2021+torrent PDF link annotation
    • https://rockeit.com/userfiles/file/8357686158.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dd9d539b4---49434162877.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/18487658157.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210903224815.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/4391936099.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/jabefofote.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/mawulakavezabetidonofagu.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/pebuwusogufetunalotexif.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/sidenukiwojegakabef.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/14b7ba07e4467cbf13d8792ba5077578/34300006696.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/81571873862.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f504f8734d---medimerexezutisajezesam.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/tojekomukoverito.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/41550901395.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/rebuv.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/44813988600.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/33101383075.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/90646973029.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136914eb10c2---66789551513.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/67008567770.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/kutesevarovedawoxuva.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/tidexixunupofuwavajowup.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/58753339773.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/sugujilud.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_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 16700 bytes
SHA-256: 68528bc67e0d7279e8631a3616eefc4880d3994aea70d95aa9534dd10db84399
font_01_sfnt_off00011116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11116 10568 bytes
SHA-256: f419907bba24e7e6a3ade2ad00f3d18f12465a477648c81cd685cfd89d333d00
font_02_sfnt_off00012943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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