Malicious PDF — malware analysis report

Static analysis result for SHA-256 febbc1020f1adc64…

MALICIOUS

PDF

83.4 KB Created: 2021-07-03 17:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c4a5d09158eb70a3fe03d09d70821f18 SHA-1: c46957da6b1fe350aa8422a0904a878b8a3c89ff SHA-256: febbc1020f1adc648f00f7a41c32c8588c61dfd6a907d71c8f4e838c0ad64626
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious content. The presence of numerous URLs on potentially compromised sites supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c1ae4f4b1---98711994688.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3edfd53c27407afede9120d57f119a34/fatov.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/ticc6qql5ljqbac3ulg5plfs71/84879044558.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078794150968---kojemamipamutixopi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c6f8d241---dizomasuzogamogebefuw.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160984f7bde318---memitibupifazanateledudiv.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160920bf01ba32---42354362941.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3105ab78---vilodirajujitobopinulus.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/vr8qoehremg8cppln7v54jd885/8033133601.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/refiremukorumikezubutev.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/zaladegof.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608531eb8af7a---85445742832.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d135aadaf089197d11d6d47fce72e607/temutitanuwikig.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/15641467317.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7dfcbfc08---kegevalofebarigutetegep.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b542478c891---wasogug.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c29ebf2e---29243124109.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/botavudiletilipede.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/s8jeelcngq1ffbsahscmjmphq0/nodagi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/19dc8598d938f1143057a35c0185e1a3/87571579005.pdfIn PDF document text
    • https://rintrans.com/files/vulusorisovisajigudatoxo.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/edec7c9fb6e12a9a39ed537780f45c3b/11511876964.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/36168546556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=have+done+itPDF 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_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 19700 bytes
SHA-256: 7275dbdf6fbe843ec769343305f08ced13e822edbc44e6c296f9abac8fb695aa
font_01_sfnt_off00011282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11282 9984 bytes
SHA-256: 01c3a0d0620458808a65024f109505591e3ea596d157d7b886d2eb88596e137e
font_02_sfnt_off000128ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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