Malicious PDF — malware analysis report

Static analysis result for SHA-256 576aec6cdc269ef1…

MALICIOUS

PDF

87.5 KB Created: 2021-08-01 04:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0064884eb500482f8d1620bf94508896 SHA-1: 2f5a6d14f4ef3524e4084e1224d75f61ec9a78de SHA-256: 576aec6cdc269ef177ab75b3f3e502d46b31ad3e8dd8856873f258c302c23b16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160943c071dc4d---72529642016.pdf In PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/la83s984b2faoniqsgkpbpfmnp/923175405.pdfIn PDF document text
    • https://mszukam.pl/dat//file/kefupizixamexenisi.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ae7ba0771---jojewewofusumoludisile.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d387d8f09ca43215388f6d8355ab6f4d/runonerejafirisuxusoga.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210604_2D4E475FAE3D8494.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/xiveverirevivap.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/eh9hkfepe2h3i5jqqo1btps631/11040229149.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb476fe2b38---dorigepubajujojuweser.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/37545326160b1716160540.pdfIn PDF document text
    • https://makenie.com/upload/files/29827386558.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/1665994963.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/savape.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1f9e04eb7c4cf5d11e8ecb96367cc357/25777902342.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/d4e520b66dd17faf422d4b2df3124128/sifibosu.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/tuzarogenodirimuwodoperu.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/8272104129fc22c1b43ab12b96572dda/sezomelujeto.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/zelokuduxowirepimo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0653aecd6---wivafuzasorofutufo.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/93281829318.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607644b697455---medudifaberosuzedun.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/16877717291.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4c2517a5---vorekesafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=can+you+use+oracal+631+on+canvasPDF 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_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 16696 bytes
SHA-256: fb652a585040ff4c3060edb37f32e11d144d293a64af44e47a98bb76cf85d9e2
font_01_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 10736 bytes
SHA-256: ad25da84fedd99f38f428c5022554da166eb4c0b98e98c8eceab3f119bc37e53
font_02_sfnt_off00013637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1