Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44cdc3e7c900490…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 16:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 589c989bc36ee585e259e914d8edf1a8 SHA-1: f5e6ae4355d7824cd4e9e9a3bb7fdb4ca066bb39 SHA-256: e44cdc3e7c900490940b4747c621ace475147dede08f7723c2b0c4d3c696814a
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the presence of these link farms strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db37582482---lododemawulozepipup.pdf In PDF document text
    • https://anmoul.com/userfiles/file/7740543781.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/79033148597.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/warojopanubulodedozowegi.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a987a0d714---5506844393.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/77676672905.pdfIn PDF document text
    • http://thebaileyfamilyreunion.com/clients/6/6f/6f45d7e5c9279c15d0bd3a3fa6949618/File/99156248672.pdfIn PDF document text
    • https://eminesenlikoglu.org/resimler/files/91052891856.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/57624514114.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/51407882503.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/xibinoxawazudafixubegopev.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b53b854a1---vidifiwol.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/31486042740.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/pqua39bsk9j4p0ptbdb147vlq5/93332186255.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8b612d417---kikupedixuzuruzuvorev.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/gk0bj0d98q2pdmv8c28atbq1qq/koresusalokajegukefe.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/migigonugakewe.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609223b10ab1b---xofik.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad858e4931---84861270881.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085257074767---84264813597.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/11264159920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+combine+different+word+documents+into+one+pdfPDF 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_off0000d740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 17696 bytes
SHA-256: 8e62a04314dcd8f852b9d8e1ae4db6ddaa451a65f096794b2b95ebf347f29874
font_01_sfnt_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 10892 bytes
SHA-256: f0dfb30fa6181367b98e4a434a701f68f3c6e0f6cd34a4d228c965d902c59e96
font_02_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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