Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eaadb3ebdc08c29…

MALICIOUS

PDF

96.7 KB Created: 2021-08-17 22:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a30897cf10c640599194dd8bec90fa67 SHA-1: 0fa9c5c38d961debb0fe9b6dcd6199f965752a2e SHA-256: 7eaadb3ebdc08c29676f92bf430a7f17edc9b5361884bfa331f92f9af858f21c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and link farms, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent beyond being a link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e426493f9b08ea9ceb078ec7775dd7f4/39381683841.pdf In PDF document text
    • http://tranhdaquydep.vn/upload/files/92115887221.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/mosanapufu.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/mimewijaridifizotavomose.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kusarudujigis.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/52046472953.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad9ed8988---62401098058.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/98075514145.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/e4tiu2v8m26980dj6iitf4itf1/bizunirosaper.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160877400093fa---xewivifovup.pdfIn PDF document text
    • http://gibisch.org/files/files/poguwakisisove.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad92ab1561---30234629361.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161009eb9aeb72---jonavufoboxogirurapuvuve.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/16131021082.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/mojakifutaku.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/1330c2ea2c0b5350d3aa46ebba3451ad/56845058381.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210713040436188.pdfIn PDF document text
    • http://calisnt.com/uploads/files/labanelozafolobi.pdfIn PDF document text
    • https://advik.net/userfiles/file/dojubugupajuvamoseju.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/xipivu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/44bb6eeea46fd88785d30925f0cd7e2b/62288841823.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021629657477418.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/46594176078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sda+hymnal+book+songsPDF 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_off00011914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 10692 bytes
SHA-256: 2fcfa1db17ec305f85131848e4e053747fc878fa2e6b8fd673af772c5afa6349
font_01_sfnt_off0001312e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312E 16612 bytes
SHA-256: 6ab8198c9f1aa2a86aceffdad0be9c343260d9e4f82cc2c30a5522ddfed24a2b
font_02_sfnt_off00015c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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