Malicious PDF — malware analysis report

Static analysis result for SHA-256 d522e9d429fdd272…

MALICIOUS

PDF

90.3 KB Created: 2021-07-29 21:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8eb42ab148f11be0195bc95f93e02211 SHA-1: a6fcef696b05d698bee762f554c5158fbb671b79 SHA-256: d522e9d429fdd2729c35d7742b3572bf6f1b33cb07395bd4d3c0a0af80a81a7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://consorzio-csa.it/userfiles/files/88491153427.pdf In PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9e3373494---76781236779.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/afb02be439558e585e27d8d01034684c/ratumi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/85462248618.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/gabigamologuzeladarub.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee876141c3---46603931211.pdfIn PDF document text
    • http://alkanboya.com/files/file///jujodagagafure.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/romukuboxabujelili.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///56016985861.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/susebogabuvutelokevi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7592b12f7f---mefuxogaxi.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/19409402897.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/eo95rau34qjp3kjoqpd55bmvaq/rizem.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/pibovugok.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/nozetagadanepuka.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/81327958813.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/kavisexikijivegowetubuzo.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/48113787510.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/51970356317.pdfIn PDF document text
    • https://medtek.vn/storage/file/zatejor.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5ef359e7fbaee8c5419bc87d54a25e9b/94780065036.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/52382252074.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/12042735955.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/31524143743.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/786fc769c504e885f0a128ec4aa36a73/55870636858.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b2855a4b---27701791915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kardiyotorasik+indeks+%C3%BCst+s%C4%B1n%C4%B1rda+ne+demekPDF 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_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 10796 bytes
SHA-256: db62991fd00c8b0af37b3c528ad5d1b8545178d9b7d2c1f1e9325304d4db81bb
font_01_sfnt_off000113a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A1 18288 bytes
SHA-256: bbedc701e0b8c6c45b50753b472587fdfe01131103fffc990b459bfd8f6cc23a
font_02_sfnt_off0001409a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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