Malicious PDF — malware analysis report

Static analysis result for SHA-256 e016003eac63d6ae…

MALICIOUS

PDF

91.8 KB Created: 2021-06-26 09:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3bf907e6b7f4b6839c41c9a45e820fac SHA-1: 3271044f1fd736a67452c6f7b9c84e90aee2ee6a SHA-256: e016003eac63d6aed4fa0aa1ee99e6adbf409f7f57ffe1cf2021a07488b31957
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm used for distributing malicious content or phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf09f24a7c4---92092705558.pdf In PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/31170150719.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/zavazasoma.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/31206692397.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/16c35b99c50b06e93564f8abedb48718/nugudijekanixofapiro.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc97cc786d---9038758367.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/32139963204.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/37108726871.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/28f36367590799b497e0cd504e069c14/ronuwelupikemi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7889d95a---87943584777.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/d7ee24c10ddb6dadc096ebcc85d2fc8e/kigizozukiverujo.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16093bab401020---nopigomumarejuzozumonu.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/fobejaxajabopexe.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/gs4fe0pb99arnkbsl1rtdldqj0/507835482.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e6f3db8a1588ee7543fc62241d236b70/sikomorilapode.pdfIn PDF document text
    • http://prosquash.by/data/19261229188.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/temorawufabepirotomafidi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/600aa223d8fd689ad296ea0f489a5daf/buxukomuvevofi.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/zefopabakozopivoju.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/93t55tbceid44vmfv5ms6ob0q6/23656660274.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/dcvbogmn9neg7gsjrt7654q50p/15050423555.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/2696575026.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/75296319489.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edaa4dec3f---64913260938.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c7bfb146cf89b5e6ed6c9deef40ab4d1/napekekuwemom.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ff199615b24e286fadee4079795fd254/wiludujaz.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/c3cc295oi4poep9hsslotd2tk4/30190329239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chemistry+chapter+4+class+10PDF 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_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 10812 bytes
SHA-256: 1c43f187ef0c9ef7abb2974ebe551a9e3c0708abd4391f938e30e186ce2c74b6
font_01_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 16532 bytes
SHA-256: 03fed7ab980b1bb2063cc841a57b2ee6e3382d091e1b1de27de436f17139545f
font_02_sfnt_off0001326f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A80 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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