Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0d77310a6b8e31…

MALICIOUS

PDF

97.4 KB Created: 2021-06-25 13:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa43889a4a03e8b030f83aff9b901428 SHA-1: ae41ab3ab1ed7076ee2082fd31666466f1747348 SHA-256: 4b0d77310a6b8e3161147749d1569bb976535fa6e82a5976b9b403ffcf6b14fc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The embedded links suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

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 http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/41355615205.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c5b64c567---wagugafelitedokogediz.pdf
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/puloruzu.pdf
    • http://alpha-cp.com/userfiles/file/28298628545.pdf
    • http://brmhn.com/userfiles/file/20210607033615_1fsgzl.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/4596331503f29db38eb7f30e02b73a62/62047384862.pdf
    • http://brainbond.ro/userfiles/file/tonupi.pdf
    • https://baongochoa.com/upload/file/95964635993.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5c9995c29f77bbb8474fc47b43f7755c/51840370709.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160866ad31dae4---15008190725.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b7628aea9af---62161551709.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815fac4cd45---22710966768.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/vobatunud.pdf
    • http://czdashan.cn/uploadfile/file/2021052615525973499.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607982b940133---remebufivisux.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d7d70ec63---dawepe.pdf
    • http://www.contectrade.hu/fckfiles/file/99234938950.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dachshund+breeds+colors
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a12.bin
afd5282dbbfccc50accdd66da0ca133bfcf53b009004983a227bc5e9b510c98c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A12 10516 bytes
font_01_sfnt_off000131ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131EE 16792 bytes
font_02_sfnt_off00014a00.bin
068d73248fcc74a77f0dcae6fdf3a991159c3295a929b0701e0b5fa379f8f4c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A00 17472 bytes

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