Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a23ec5b3487f98…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 03:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb68b58f49ed7b89ef4fb32f7325b29d SHA-1: 3319422a51f2aad24b42ec8cef65b55138bdc6e8 SHA-256: e1a23ec5b3487f9854afd69f2ed6154a787163670b8a35e2515a88a321cc703a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://philabc.ru/uplcv?utm_term=list+of+army+field+manuals
    • https://congchung7.com/upload/file/xobisamikaxida.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860632a72c6---nowirunafesomovipijiz.pdf
    • https://wickedcheesy.com/images/file/lojulutune.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qfhe62kh2lo7ajq9pbsno1hk99/12049836789.pdf
    • https://hosvagyok.hu/userfiles/file/fovuxapeduxuvulivedopo.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/54d89f66a7bffe4c64440f0b30f4b0eb/61968177997.pdf
    • https://ferado.vn/userfiles/file/jeseroler.pdf
    • http://amandatravel.com/userfiles/file/xuxenewazit.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/mavasigisokikanosokizezu.pdf
    • https://edusfera.pl/upload/file/moduferulo.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a391682ca46---vazarafafawawi.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/126de314969346992ecfa5afc1ef5b65/32951004826.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/80280034782.pdf
    • http://jucal.es/images/file/43382864602.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c56a26af09da6ade3c426054c4ddbf15/42305187166.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b02ea0cb984---kasijaxevolovekapobupomi.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095bb517a353---riwomobitabojetiteb.pdf
    • http://kochamsushi.pl/UserFiles/file/87417179828.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbac96c36b---kurasuwewuzisob.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a615f87e039---kofuweduwop.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b2787414d21---86822759452.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed4.bin
c6d178fcee03db9a3150b1dc3bed86d7008ea6ad28152d7a0a8bba26b444e4f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 10684 bytes
font_01_sfnt_off00010759.bin
944e706daef007d170339545f4a5e049e290c02e2374c8b46cfd7dabaed80629
pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 17300 bytes
font_02_sfnt_off000134f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F4 16792 bytes