Malicious PDF — malware analysis report

Static analysis result for SHA-256 489b3286933ffe83…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 18:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf700b58eb7258f694edccff15ca022f SHA-1: 43b3527a7eeba3846ef1e77d87d167b37a7ecacf SHA-256: 489b3286933ffe83dafad76a45ec64f1affcad5ed9ae739de1c131bd4657832a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristic findings strongly indicate a phishing or malware distribution attempt.

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 http://gibisch.info/files/files/wubewewaxub.pdf In PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/wutusebaved.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0abac9fbb4---68413370271.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/30084088028.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/3985876315.pdfIn PDF document text
    • http://3q1p.com/upload/file/2106271027317500025rl5m4bnw95i.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/naliwelimogel.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16079b5910c5b6---tiwekuj.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/47387857020.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/lmas90igukto1qllg4c5i67ai6/49870144533.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/84094620636.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/51793280366.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/65249461462.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa1ea4186d---28665364126.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/nobigona.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/1012546912.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/kavoxab.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f0f89191ef31126c5b8bf04939286e63/52999508890.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/pokamejif.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8baa0b6ad---sidiru.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/wibifotoju.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/78108435462.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/505098803a90401ef89c1cc411e84383/19431604042.pdfIn PDF document text
    • https://songhongresort.com/img/files/lebadorufakuta.pdfIn PDF document text
    • http://chikatere.com/Upload/files/23219845155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dogma+comic+pdfPDF 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_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 10316 bytes
SHA-256: b12b8b4e5af9bbbfa242b825afeffc313575712da5cf0e5509a5a429ba45e9f5
font_01_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 17796 bytes
SHA-256: 2f32ebed1f6349728052ca98bc6ab990fb979986785f01389fb72a0af00359db

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