Malicious PDF — malware analysis report

Static analysis result for SHA-256 27248d121e476790…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 04:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5695f604b8cc38a34176b11cc1775b13 SHA-1: d65350a808ce8a53ca228368b9bd443a2ebf96f0 SHA-256: 27248d121e476790b016ecd3a48546fb0cfb76af099c8e071c7e3ad1e07cba6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, likely serving as a distribution point for further malicious payloads or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5a28e545f5981e217ab094b8f66cb82f/renikelozanosunaribon.pdf In PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/78285292104.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076c86cb5aaa---17059852782.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c86db5bbf6---xeduminokuxakanazuxeju.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/4k8l2e0201kou1ffb2bm5huqn6/rejoxawuxawo.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/0934047ae96b21366bf9fb80f17c48a9/7160135015.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7990d03003---sikalije.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/j6uqpiuhs5a2stbfl1g9o24cio/wimixulomataxubinatelu.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/73338461424.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5db10ed50---40492500397.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/16552128872.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/vawuvidupizerip.pdfIn PDF document text
    • http://eden.pk/mycms/uploadedimages/editorUploadedImages/file/judokufodiwaloxugam.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610c429f6b234---gagizokawipoworor.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/resiporolosinozet.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/wojumejegugilorikufa.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/96438275858.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b227c6e9a---neduzilejokesidesi.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/fitesomepubajokisagejag.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/posaporadesukuxaboligu.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/bd1c6bb44fb249390faf6cd818678539/jetala.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/85294617428.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6eac86786---numamowikinejuliziforabi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c30f55547---xazenidiz.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e729b0aa35fbbee289f1fe029fce7ea1/49154661725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=valkyria+chronicles+4+artbook+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_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 18976 bytes
SHA-256: c5a2d2ad208834f9ebad3f507e195a0a082072d4ac25afe5483ef4166f23317b
font_01_sfnt_off00011617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 11108 bytes
SHA-256: 722452cf6e15a4de737e635dc3e6d3aece598d6e0fdd01137dbd33c6d24ae705