Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d7e65368d55b51…

MALICIOUS

PDF

133.3 KB Created: 2021-06-18 05:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e831f2b06dcfe54ed73e772fcee4af7d SHA-1: 5249ec7aeb9ce435a403dbd256537507de60efc1 SHA-256: 45d7e65368d55b516faf105e8a50fd931eec43e015b22bf6ce2f15298939684a
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 0.9994

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://oniceh.ru/uplcv?utm_term=godhumai+rava+dosa+in+tamil PDF link annotation
    • http://eraucheta.ru/uploads/file/lujesewaxuxuko.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093f41f452c8---65634730863.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092510c04270---32956534691.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e68ebc89d2da2cef3a56f18a10c912f7/41648044510.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/13849352220.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d674570e---powijanesutisar.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607372a8a6b90---99419134550.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/itp7aic0havsdb50ehb3q4vmqs/bemakibavedomiwusebijuxip.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3cfa7fdb---6417334641.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160824b54d52b9---99601379762.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b9f346202---20197881125.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qk1fs57bf74q77ofnss1nbv8sj/25752100351.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e7c54db00---52834020869.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/alm8crn8tj5arc494sqm1rmanf/kovudukubiridimeliwosida.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/932d528ad6d7e88974065f6155014590/diwodurolabonakepawabina.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/nonuzujamifowogosinaboki.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/90dcc62623898e9533e4bcab6479e419/duremefeporofuwuzoji.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00019ddb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19DDB 25788 bytes
SHA-256: 96a24addb6dcb47f47aaa0e7bb6c195799906d8312eb9cc5cc05053d0d5a388e
font_00_sfnt_off00018c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C81 5156 bytes
SHA-256: e6395af7472189209aa5d01903c77e9369ed81996963296885bcfd2ae3265000
font_02_sfnt_off0001d198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D198 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_03_sfnt_off0001da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA25 14200 bytes
SHA-256: 851d16ada87545fa0060a03b20cc73de885c18f6ec1c50de2c5ee77c3247fe44

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