Malicious PDF — malware analysis report

Static analysis result for SHA-256 93867afc3668fa18…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 01:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 274ef143100a96e5886b67a2575148e3 SHA-1: 63ac7ef8138056867d56907a0b5e9682dbada528 SHA-256: 93867afc3668fa18ee86bf2754e0ea1a95e5a30e607a79e52e424819c0962f2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f7bfc1aaafa22c00ab8de9f29d9d0ee/bawudiwene.pdf In PDF document text
    • https://basisangka.com/contents//files/jafigegugutadudeni.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/01c692799a18da4cde9cc24e00e38077/23448786934.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/vavuwizararokanej.pdfIn PDF document text
    • http://liily.jp/upload/file/20210801051128.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/429bbe8b47b617023ba29d3d3544c5b0/putifiwetal.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109020206253010.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cd0b1595e---38143212657.pdfIn PDF document text
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/kazakipuxitarezorupamola.pdfIn PDF document text
    • http://dmkert.hu/files/file/laxupudikokadoxisemup.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/3779bdad2178d3c502fb178bcb2b4093/wapewe.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/wedojudagogili.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/34825926967.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/24733596454.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/50309206265.pdfIn PDF document text
    • http://eko-uklid.com/files/file/10963565810.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115cd2b356ab---83942699135.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/wudexijad.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/nakupek.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/57723784860.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/gufisupovidutixijebope.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/dorojefebu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fa8971f38e95681e1dd4fc41865c7780/danupefoduwujad.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/96309808240.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/tlcq1aroclrbmsou03msqkrrme/nepexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=insert+multiple+pages+of+pdf+into+excelPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/67b12c3a38f3d5cb82973c45684e99de/wabafipab.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_off0000ced6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED6 17056 bytes
SHA-256: e4a0d3f2f85dc412613cd0e08942cb79a84ddea876f72738373f52d222e179a1
font_01_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 11116 bytes
SHA-256: a87dfe04c72c6c3dc72dbe1baea0e9c159dc49128dda4981e16da7f222cd7efa

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