Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b892364013f7213…

MALICIOUS

PDF

156.4 KB Created: 2021-06-18 22:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a96fbb2f62556bc38783283141037e17 SHA-1: 0dbb2e53ea972d10a880bc19d9b84b78d18e2e91 SHA-256: 4b892364013f72130271f93e9d8a962bf52b864ee8552a44e2506f875b2c5d7a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of these links and the nature of the hosting (compromised WordPress uploads) strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://biomassasia.net/data_ed/userfiles/file/88722928616.pdf In PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb455492ff7---36895249309.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/30e90ff7542df3ebd0e96954ae4f4459/38092944365.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/78346584000.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd77d0f20d---jamogid.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7d7539edab0d2a44ed30f38cff6a6a4d/25078163034.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/bc482fe5d96a8cbe3fcfa83056f7ef11/35902849775.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/nifonedupebi.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/t1bpnvsk2emp98o1j8fsl5fe9j/gilixomekom.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/45252243937.pdfIn PDF document text
    • http://airbaankhubon.com/userfiles/file/69365514103.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb26bae934---dagefalexedijoz.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/15724286897.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/6306495864.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd02ed2326---63099547747.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/24637504648.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=voice+grammar+rulesPDF 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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000196c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196C3 36488 bytes
SHA-256: 7b82d4070cd0313cf18effaf95edb1725ac71258bdc713b5017106bf3fec1952
font_01_sfnt_off00020776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20776 5084 bytes
SHA-256: 71d00f7b856f44df85cc3f9b9e54315db29b5b3018a1a68f9a7c67f23673c76b
font_02_sfnt_off000218af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x218AF 18196 bytes
SHA-256: 42ec6ee08352fc19190dbb9b536e86bc58b5f2a592cf39e3b829ceb9b9e6a979
font_03_sfnt_off00024ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24CA4 16244 bytes
SHA-256: e208d6fa2ecc1ee8b98dd0bd1684ffb5e3891779cf61ffdb9cb439440ba08a20

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