Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddcf1ac360335f2…

MALICIOUS

PDF

192.7 KB Created: 2021-07-03 09:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e2bc9e6b6de7d06b489c2c5f94525452 SHA-1: a6f987db443ffa55e7100c1f5a8cc06047695bd3 SHA-256: 1ddcf1ac360335f2ef324ddfbe2564c594c84f89dbd170edd02f3286e55b3afc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised or disposable hosting sites, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://esrafisek.com/images_upload/files/vulejufugovubixi.pdf In PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/of0d4jpti0ng7ac8n0gr9e6cjc/dojovasuwirivufufifawez.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160856c92b0265---69626295805.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/54f232b0a746ded5968801c75a6cd403/livuribusidelevanedena.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/45824758012.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29668133882.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf72a6c095---velisadato.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609438c548941---risifazitasefa.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b644f6f2---7422356146.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/fegefefesafejujoj.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/79848157291.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/29780772958.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d2c84eca---vukidimasefedol.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/48577810051.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/wopevoku.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ec88aef59---81084715494.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/4724068205.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/pomebob.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ad00635f7---zonemabitokimizanovuvube.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93342172d---57688944998.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/hn2brofh9ksigkmjnhn4ge6276/savunupep.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/dabumota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=doctrine+of+salvation+pptPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00027a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27A50 16604 bytes
SHA-256: 65dbf972f6fba7fb87c4e83806242fb491df667599b9fb49f7ac194d60d8056f
font_01_sfnt_off000291a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x291A7 20392 bytes
SHA-256: 056fafb4b39b0ea337b862fdd68a62c338ebe99591ae80923932950933e1b83f
font_02_sfnt_off0002c462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DC79 10540 bytes
SHA-256: c8d1ac2b106875531ffb9e1b502154b40f3884ec20d27317d0f2111ab96fbd55

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