Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92421b81f2e1dd4…

MALICIOUS

PDF

92.2 KB Created: 2021-08-07 21:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c27ce77fac25be19cd2b030e357c41ec SHA-1: ebf3e48817fc8fdb3db95f5eb9b5b74765afd22c SHA-256: d92421b81f2e1dd484b8464108a94af2c88619ac77d991aa205ee4f2544ec4ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary goal appears to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://laptopcuhaiphong.vn/upload/files/relozogajugajaderar.pdf In PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/25240044e257fe3c70fc499754444fee/31059515445.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/lonopav.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///5509441243.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160d88c326739a---50272251900.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/94f8a675f5da4e8473749ebc5baf7452/35458333746.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/buberepavadifovog.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/54158031232.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021043006164873499.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160990c4fbbd25---jisijovusiviv.pdfIn PDF document text
    • http://jaika.in/images/documents/files/waxipop.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608def61a49ee---60673642488.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/sh0cn8pb0jf27f26d515f509gq/91895298567.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/gevenujusamoranojud.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/tq952pgoavj3f1d75g16nr316n/difurelegatilugage.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/199d1dfe4f183f62d2e2ad1a135686a3/27207084982.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/20056352175.pdfIn PDF document text
    • http://k1a.ru/images/files/file/tasusomibulonulu.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/67397352614.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/8486005686.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/42515248350.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gesowigusixabovewiko.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74079229758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=escape+from+tarkov+trial+code+2020PDF link annotation
    • 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_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 11060 bytes
SHA-256: 4b1839758c32ffd1a485864185b008730a66f48567c2db6a101f43cf4a08f215
font_01_sfnt_off00011c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1B 17536 bytes
SHA-256: 9f71ae9be4844606f8ef889db7ce3e5c754e2303203335529c3c47dde2d9411c
font_02_sfnt_off00014a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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