Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb41d5c3b642444…

MALICIOUS

PDF

105.0 KB Created: 2021-05-07 19:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2116f4e58d42a262736998622b9db89b SHA-1: 551e5f75a603eb55eba0879b3e819735e6cc9680 SHA-256: 4fb41d5c3b6424443bd36532064fd28abfed71c593b27187002c55b99b0ba8bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=burma+movie++isaimini PDF link annotation
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/17eeda63690b759d37776cb1d9ad382b/14557536458.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78406de52---gurimakaxurip.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16070872c41196---vudodetan.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abceea157f---sabopoludef.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c5784b1702322fb8a76cd505c5195e5e/nutekesalemepumedaguba.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/94412119552.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/a354f627eb0115ee524e36e5ea52192b/kapazodidufelipufal.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/8048e151672fe80cb4e78391e0aed2e7/bumavigofos.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/5709be99549600cb79e1093e9102d72a/rozineva.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zuromirusemisogabulamer.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/oj67o7tt1au0aprqfb9sueubpq/junaviwibetalinisezo.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/5ponhibd3tqdu1s3drjb6c6hkc/29848797747.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ff40b2a868a427660fa5339f663e9979/nedomolomurifovusewumamo.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf7226750---93748410140.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ebfa42be9---kamafakafisunaf.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/dinabiwuvas.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6d888bd4---32964677332.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 5016 bytes
SHA-256: 00e5a284db37e439d08584681b05db097eb356f5800f0521cd0251f7766e8653
font_01_sfnt_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 4908 bytes
SHA-256: 1d581b99fa23aeecbc16fc929f7e2cb5cf5aaeb09f3f4d3b0209b66001598b4f
font_02_sfnt_off00014603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14603 11856 bytes
SHA-256: 082fcc4bade5e6ca8af11467c47c23f4c0c38bf41ec2c22b980a2d1bbfb54aa0
font_03_sfnt_off00016def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DEF 16620 bytes
SHA-256: 226d33f0f0e771b58fde1464f009b98812f1f5000cccec113429c1ec66bba056
font_04_sfnt_off000184fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184FA 4844 bytes
SHA-256: 402a1eea26386d2b76239707ff59b4c095342c21cdfd5ab8fd19adee13230be0

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