Malicious PDF — malware analysis report

Static analysis result for SHA-256 b798b864d0f46383…

MALICIOUS

PDF

89.9 KB Created: 2021-09-05 15:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b564da5750b6704cf800c2dc2c76c96 SHA-1: 07ff90ff9b3c1ad1bc84ff0fee73d040535a1940 SHA-256: b798b864d0f46383832fc849124b76639a8e1954a1c35ced3bc02607c92720f7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of link farms pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of numerous URLs and the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3lq6vg3iri2r0o75ev6ghe1r1e/letabu.pdf In PDF document text
    • https://brakos.it/file/83666491138.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/geraxukilodagozonob.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/gibevitefuvut.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1aeb0debbd3c63e9fe9da0e35399a187/73136859088.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51a65db53---2122038179.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gaparolorekamelimo.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/0c52d3ef0f3e73ebfc67332dd7967aaa/latijuxif.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/67e6412c547d2970c8508089b8886e63/kurawejenolilanu.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/oc736usr0rbmlb859t9umv69f7/xatidixufebewupepu.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/70101919736.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/vojiragamex.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/48883015455.pdfIn PDF document text
    • https://menu2uplus.com/images/file/61180346781.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/53054823185.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e12077347a---jowepapelamizenuradofu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16127837389d43---19347347952.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/wasenetir.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c4c349eb7d335e1259771414f1d95463/84372239357.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/53849805046.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/154661bfb7becbf760def75b3ea82c31/telujedisosijodawazuv.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4cf2476b2---54127380052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=catena+mundi+3+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_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 22096 bytes
SHA-256: a49436e1b55cf1a721b98009babfad6fc967b64bd6e9283e543ab2bb38297ad5
font_01_sfnt_off000129db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F2 10528 bytes
SHA-256: 5c95bad2de449369048b8618c00ba752bc5bde59597663ca99815fd28fe11ce2

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