Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc98df54a2a9bcb…

MALICIOUS

PDF

153.1 KB Created: 2021-07-13 20:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 01412034b1555984fbb7fd98c8ef9f61 SHA-1: d96c8da02324b58d0249989612c05a3b28d460ce SHA-256: ffc98df54a2a9bcb5c6e83ab3a03c87ef90658f9c6ddacbc179e3005782e669f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, directing users to multiple compromised websites that host further malicious content, likely for exploitation or credential harvesting. The presence of numerous links to WordPress upload directories suggests a common method for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/e874b24d5890d328d26f3c8a66b54bce/gupizowos.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qgle1q3602o8r6cuta9r07dnp5/dokepewesupara.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbde29f270---16407234818.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4f39113e6a62eed4964017f2191f5384/81675220919.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/99qcmb5jfasep0elkn1ccsr34s/86793124585.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c64eb4cdb1313fd3f8027d05e90acddb/90102041880.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/dexebal.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/migekemumasoxaditunig.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/e4e56244c3c08b3e0c88614afc76787d/towadesabilajitinifuge.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/66403737072.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a16b058ac25---57021441659.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45dbd90d1---44000318095.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/12104878436.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/mubazojigu.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/deteruj.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/96012479601.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e1313f53---mugowinojedumiwisixo.pdfIn PDF document text
    • https://tdfstore.it/file/bedarogadetozirosa.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf4200fa64---kunisikugu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e7dfebaef---86419395742.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf8aecd64---duxamajate.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/tuxoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=clemency+of+capital+punishment+is+granted+byPDF 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_off0001f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4DB 11452 bytes
SHA-256: 2bfee1d3ef057ea4cecd18e654e6b15835f10dce2bbc6b3ec1a0122b7b1ea653
font_01_sfnt_off00020f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F4F 17916 bytes
SHA-256: 192da3514729dd291b50cee281d683e23afc857811c91acab165c47a1406b0f7
font_02_sfnt_off00023e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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