Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0281cf81319dcb7…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 20:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1bdeacf2782f92242a7acd8c36fc3171 SHA-1: dfc937afca6a61801ff4f08f476d7bf96568edc7 SHA-256: c0281cf81319dcb79ba4023d20432295516e1cde66157df4e975b2e64d0ad726
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous embedded URIs pointing to compromised WordPress uploads and disposable hosting. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/13b52d63a6fd07eea568836cfe8544d4/zusoxom.pdf In PDF document text
    • http://gokea.org/upload/editor/files/goruvomuwabukotibesila.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b73e5de73ec---85091316878.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/zaxadotevexopisorovoto.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/sapijisosojederevibi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c37adb710c3---potemad.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/kijajezuxesataxozedirujo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752b1a8484c---17651394716.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/18323722999.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a12341d7---60752753056.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/budubuverewifizotepalom.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/watazudafimetepifabomawo.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160835a4c61fe9---xifilunerulig.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210609_7CBFFAB57434E2B7.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sh1u93jrlkn8bs922tm3lmo7r3/dutarotejafoziregox.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16088c19c3f459---valiluderavokizajemoneb.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/87c8cc697fca657011340baa6b9844dc/81264094118.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ba01c8727dfdd3f024ac6a19ac9781a6/93559059878.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/guluropo.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/50sn1qa29e1qt8fh7fgi5jtq1r/29937331731.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c3a415b147f64f40edf807ba97803164/86323866247.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e05fq81aij1e4e62gqiv7n997/99258980446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=which+is+an+example+of+a+heterogeneous+mixturePDF 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_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001027b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 11124 bytes
SHA-256: 187558f631e41403a0214a553c478a09df14f77aaf22c81dac36e0c2f141a8f0
font_02_sfnt_off00011c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4C 17468 bytes
SHA-256: cdca9be0e7264155ba31ac2d075491c50bd672cfb92b04fac15fcf45ba5ef215

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