Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6266beb2d37c741…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 21:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f782944cf74ef2fba0d8c93e31aaaf3 SHA-1: f02adef9c4499a8a2561a7bee62272e2fd762824 SHA-256: a6266beb2d37c741facd720889b7e3c446935afae2b858b87b96d0b536cff11c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://viswinkelindex.nl/images/uploads/kizuzuvarejep.pdf In PDF document text
    • http://nuovojob.com/userfiles/files/24188267201.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/farujenovimolebevokope.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/24839104850.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/32113212618.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/zibigifijibov.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/difetarekago.pdfIn PDF document text
    • http://temple.mo/userfiles/file/25010312208.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/8332576405.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/mokeluneguf.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/41843810654.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/dopitazimosiwidamosisinuj.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/vaxopoxunege.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/54132365121.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/sigomodamagesavexeg.pdfIn PDF document text
    • http://eksternest.be/images/file/jagifokorokalaz.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137e60924485---63270791701.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/kuxoxabidirejunujupeku.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/527aab9396e6f600748336edfa74968a/78197749799.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/sokivujeguzom.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e961111f805ab229d37eef53fc205086/89274690684.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/woxota.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/fodinexojuviloxag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ayutha+ezhuthu+full+movie+hd+1080p+downloadPDF 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://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_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 17544 bytes
SHA-256: 8079023ad13074e3479f24a2781877aa10b42970ff4abae17d9402179ddb4b6a
font_01_sfnt_off00010497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10497 11284 bytes
SHA-256: 8ab1698ba5af5a662f16a2c63a9afa19e9a228614cc6d3cb062604842222ebe2
font_02_sfnt_off00011f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1