Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b28d154c0006763…

MALICIOUS

PDF

86.5 KB Created: 2021-09-06 03:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da7a73c6efd3d22ec1ba0b1cf777e738 SHA-1: dfcb8c81a74f4610f18e63e43b98fe13fb174014 SHA-256: 6b28d154c0006763f7187621cd7026d829ad4d1d1b7763bd31e567bbb7f9a6bf
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, which is likely used to download and execute a second-stage payload from one of the numerous external URLs. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to trick the user into performing an action, such as making a payment. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://huntic.ru/uplcv?utm_term=rockford+fosgate+p3002+manual PDF link annotation
    • https://sabunwangi.com/contents//files/11192043912.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/rigupiwuna.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ce9dc157---sewanoluxuza.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/a6f4058b9b21b2afb0732a0aeda39a19/23301735927.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5ac564f289fbf596ba49048f3edb912d/kefonevunevuzadofedural.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/103de077642242db0e674f3a2f7fdd3a/89567153116.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/51917320309.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/9028383640.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/47437318042.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/dojujofuwase.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28b16d656---ponoxaxuzopilu.pdfIn PDF document text
    • https://novitas.ro/files/voxetetutajafobezoreme.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874006cb2ab---65038350726.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a98fa6843---71790899577.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/97408881783.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/taduzikatenisuzakuwudinad.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/52901482622.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rkrf84i6rn3qrfj1qs7r5c5vpt/kunumogovuvijex.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/tabiforefilirow.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/36336774678.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210819_102029.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/17176183246.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wenidafafevutimilifuwin.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210822084336.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160828a6af1479---16083106059.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 11524 bytes
SHA-256: 606691200cfde8bb0721bd23077632d68ec9b1f730073aaa6916feae9ec5c1b6
font_01_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 18804 bytes
SHA-256: ee7d3b967a8259ba988a095fd8b26066ee7ed6841ffa37b70fdaca384ecfbd5b
font_02_sfnt_off00013283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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