Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea01610d1821c988…

MALICIOUS

PDF

95.7 KB Created: 2021-06-29 02:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7bc5f54e4c7c704ce713c0fd5a4dc3f0 SHA-1: 6efd217df31afc747e596693281aa9668c95411f SHA-256: ea01610d1821c98897f3eb3bbfd67b58d6aa0bfc5171bfbcc02bd6fbd63b023d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also features a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 http://albatrossmrn.com/konadnew/userfiles/file/puravapanota.pdf In PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/27734605745.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/kerowalelu.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/kesabowibigamavu.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/51304750133.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8i8ama2rln8trjkbip844iiaou/zadasoseralizanidifareno.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d96eda6f---lazokawixemovosa.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/76793271600.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8affe628a4---dixutalez.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5686f2b1d9.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/kobojomufitigetelipava.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072748086129---pubolejew.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e49d51da1---72906121416.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/96886919606.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/15408757472.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/87296216639.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/2688e49b3d670b2f97aba2dc1b6bd4ea/94217685713.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/tc641vskhf38h5rtm9p44tabns/gupulofazujob.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/44rjg73bav10adnaf9bcopv316/43224986122.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/69a9bfb6973f3896d871d1c571442d42/mipufutomaxevogezajijowo.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/tijomemuzogifalejakud.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609adba6902ec---midirutikefiluzof.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/vujibasuvikapova.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/bevup.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/usap24bcn4822ub5alvld3b5o1/vulajolerobaran.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f0c1be688ee2af98343ac08916b7f781/jamulejazinani.pdfIn PDF document text
    • http://iltorg.ru/upload/file/87327248361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+girl+on+the+train+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014118.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14118 27180 bytes
SHA-256: 8f539b4a07d36d9321c6995c4d898d92f147f5aaa0b7a634f89fb11f85525c90
font_00_sfnt_off0000e154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 10656 bytes
SHA-256: 45ade88100798229a0ebd6b25a5022d1db9f69fccd0723ced53cd7e0560a91d4
font_01_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 18588 bytes
SHA-256: 68af0fcd1628b7ff3c0b863e8d393ddd7b9d95d19adbcd767992536416c8e8d4

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