Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6043eff79bb0466…

MALICIOUS

PDF

81.7 KB Created: 2021-08-18 18:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d4d5fdde74328896ffe6b6a0d6572a8 SHA-1: 637391304606ffcce1398aedab95e44238316d5d SHA-256: b6043eff79bb04667857d270b8be62e209e99cddad38013c5b3a15c1ef4cc5c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or are part of link farms on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader, likely to download additional payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=how+to+confront+emotionally+abusive+parent PDF link annotation
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607560a0a5ac6---41706518216.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/33418315202.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/kizuwenagafomuru.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/losifavijapu.pdfIn PDF document text
    • https://olterus.org/contents//files/xositotadob.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/3303141174.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/8dfa9d9914c366d847426c561deb59d2/tajakusasem.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb016b9b2a81be1385f8a37f3d887fc3/89526022585.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16093e69733c5b---nolokarupasumax.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16093f80470af2---50877780788.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/dijagozofo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d463bbc9b---48116070755.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/000ddc7afd838e6b7cca0c13249a14dd/16180191421.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/82179547482.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/9199007208.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a7388e12e---84856899824.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608680788dbfa---savozitivovuw.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/xosudepow.pdfIn PDF document text
    • http://yuhongzg.com/d/files/jemak.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/4230c3d27216c17908909666e5cc9745/56033428216.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/wubawoxelodipenapakimod.pdfIn PDF document text
    • http://alkanboya.com/files/file///pidodomizezisu.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/98484590737.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_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 11136 bytes
SHA-256: c81eb22580e3a31ccf459ca41ba5da98e88268050112ae60e5c858f6b376f307
font_01_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 16940 bytes
SHA-256: 06df7186086d517e8acff58e5f0f53f92ed8f5cc8176fa169e9ce9bfcb13762e
font_02_sfnt_off000120e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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