Malicious PDF — malware analysis report

Static analysis result for SHA-256 40575ac4572c6fea…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 01:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbbe234a064f1bc5ef428caa1e64d1ba SHA-1: a7a648fdc6c9f0d92a9ce5a054fce1d59c9d6f1f SHA-256: 40575ac4572c6feab5e16733166e0d350a87ffce92995ffb38b4dc22c4686d20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=douyin+downloader+apk PDF link annotation
    • http://liveisagenix.com/ckfinder/userfiles/files/jujuxogosijitiwoziforisid.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/10199379353.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/98157196471.pdfIn PDF document text
    • https://olterus.net/contents/files/xudiw.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/43190005753.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142858d56c34---84922360736.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/81730720540.pdfIn PDF document text
    • https://www.confirmedtour.com/files/bijeworunezixa.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/limejo.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/72159813134.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/a0gqo3gkkg5g5h93v7b1dv0o505ffidb/voxipeb.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/buvosu.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/nomusenofifunewis.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/devox.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/62084580686.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/59114446993.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/84824272532.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/abrdv4ree27b25ecd7bqubeduk/43707809783.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147aff0dd921---24516053318.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/beluxowanifapotumabufej.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd286ad2b0---zigolimolifu.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/potuwisadorogunebipe.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/wupewagaketifed.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/natosimilud.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_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 20436 bytes
SHA-256: a4bf530217b70185e0764fe67cac59bc4eae812655c98bc48dd59a10fe947d3f
font_01_sfnt_off0001119a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B1 10512 bytes
SHA-256: 4cc616a45292564ae537edbeca213a5fbd239a697870f2cdf66358d35381dbb7

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