Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7394fd4a641d65…

MALICIOUS

PDF

86.7 KB Created: 2021-07-25 16:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cd3bf6cb7dbc4d10380c39170a5bf6ef SHA-1: 468a42b1923bcd725c222d40a9a8e7b61f73b382 SHA-256: 4f7394fd4a641d6553e8d5c92724034ccf52623ee087bb0285bd4419a5c70c68
196 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous links to potentially compromised or disposable hosting sites, coupled with the 'Password-protected archive handoff' heuristic, suggests a phishing or malware distribution scheme. The document likely aims to trick the user into downloading an archive, which is password-protected to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://prestinoequitacion.com/imagenes/upload/files/18393826069.pdf In PDF document text
    • http://altinay-law.com/images/file/21833186242.pdfIn PDF document text
    • https://ingmarcomantovani.it/file/19711937446.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/wejoxuriwogevigakowavuja.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2nmu5du81821r0f87oal1u8056/nazamutokejonuzalu.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/81477468302.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/rororoma.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/69296859946.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3ccf66333---bufewo.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2411caa3f---65213425706.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6b18e371---sidaxuzi.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f909cec1a6c3f50cf3bb63a065e3944f/43534199626.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/naxafiwa.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa8da1a67---jexezarime.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/fmorh3f10f9g0chtb5ahtsreaf/powafowufubadusofuvanak.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/72912126557.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/pikc83ji0r40b1bmmmf236n1bd/91854799878.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee7ac2f359---zirexisetatiludud.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/70858351097.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/759509707ba893b2ede532ac87a652d5/93720603320.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5efaf7ef39---44383702406.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/94400916539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=educaci%C3%B3n+financiera+avanzada+partiendo+de+cero+autor+gregorio+hern%C3%A1ndez+jim%C3%A9nezPDF 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_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 18004 bytes
SHA-256: 01cfedef298227a03acbab737947d2e28819efd8a02dc19d0de9a1d991a2e8ce
font_01_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED5 11664 bytes
SHA-256: 48b34f384d1532aae962c8ddb8896881830c511faec7123e231db9f2403ad01a

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