Malicious PDF — malware analysis report

Static analysis result for SHA-256 025f53777c532e1b…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 02:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b005eb88920e249248955228df99634 SHA-1: 1a5895bef94af1b4ee1404782f71311290006981 SHA-256: 025f53777c532e1bcf6a5a3b949d9bbdc567cbc061a5f0799bdb2d74a5df8e95
164 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities and delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous URLs found within the document, many of which point to compromised WordPress sites or link farms.

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 http://www.tobywells.org/media/fckdir/file/tuxazog.pdf In PDF document text
    • http://lt101shop.com/userfiles/files/wufanerawunupafetife.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/lesodamefosupakilaxupiz.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/44606379461.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7268ac3f1---86245459469.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d2627cf1e---18851249247.pdfIn PDF document text
    • http://npas.ru/pic/file/vedadaxesidekitowa.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8256a25d---verikava.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/n64k64sjouklg73inel9kbi45r/82559180681.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd644bc5a24---zokamuxetakimozinuxoleza.pdfIn PDF document text
    • http://drironcat.com/images/file/35606531654.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/bodedutomaxanibuteg.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/sufaj.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/24163847678.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce21d14a5c---tunosetesogenavasuwef.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913636db011---79016623255.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4c377e1a22e19be7a99a885fd444c298/tipojoj.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/60359334116.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/be89df159eec7bb625987b8d3cfdeb4b/mugekokigufa.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/ruvopesutaluk.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/kerutivorefejudizal.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/kuzil.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/zajatisaxetujizesubujel.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8cae0e768d60b7ae4d4111b8907905b6/80082658082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hack+android+phone+kali+linuxPDF 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_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 17928 bytes
SHA-256: 292eb9047a12efaf533e4629d00988a23777864c5220ba9e05ba65967c8114da
font_01_sfnt_off00011c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001343d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343D 10628 bytes
SHA-256: f51489ee194293963230a51835b5546a4bad2064871953b61e75625da477714f

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