Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea04a134705ee6d…

MALICIOUS

PDF

98.1 KB Created: 2021-07-20 14:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dac595367c8d5a6e4b50cd60a61c8a8c SHA-1: f36bdf044e0605919c54b0aa0b02521aba2d6c61 SHA-256: 5ea04a134705ee6d1acca07b927d0c6a84edaba56299f35b8f6db5311f7ad76c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of multiple links and the nature of the detected malware suggest an intent to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://bloomeng.com/uploads/35234753739.pdf In PDF document text
    • http://edu-family72.ru/content/images/uploads/file/61823052988.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210606131017.pdfIn PDF document text
    • https://zzhqhi.com/d/files/perivefozagarewad.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078799e937e5---47484348888.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/77632271913.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021062709085150.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/55469845213.pdfIn PDF document text
    • http://iworking.vn/uploads/files/lobigelisapunegijib.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/qm2vcuug07u2f3ij6ps53thaea/63485568104.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/47396544615.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/56133136182.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/9384685168.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dc241372a---46875053521.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b4c8e7dfa---kejuravon.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210707_6FCDD6DA9DAAA6C7.pdfIn PDF document text
    • http://stylekd.ru/files/zuvamanedugavobisew.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/zaxeposobinunisumusixesa.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b559d5b70ea---38484283731.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/saridakonoseterekavefiro.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/46332511566.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec85657992---18536065002.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7aa6ea4f3---49496927194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=embed+gif+in+pdfPDF 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_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 10272 bytes
SHA-256: c720578eee37e7dbc5cd120995cec494345372174c1602d07cf401d7b4403735
font_01_sfnt_off00011d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D08 18712 bytes
SHA-256: 834071364bb54e1ceb706e56855ef15f9c9286df32870e3592fe72cc3ea52b15
font_02_sfnt_off00014dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCD 16076 bytes
SHA-256: 0491ab1f9781984131449868ed95f15036bddabad70a51597ae233fa8bdf08d0
font_03_sfnt_off000162f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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