Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d69581ffa44afaf…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 10:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 18db37a7d78cc4245014229df3ec8e4c SHA-1: d0e004bdfe170209d9bc822ff1298e37027b80a0 SHA-256: 6d69581ffa44afaffd334508a153c6ac4a0631c8fa1f4aaf2767d713e936d734
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest potential for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://irlanc.ru/uplcv?utm_term=how+far+i%27ll+go+piano+sheet+music+easy+pdf PDF link annotation
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161294f2da6e4d---66425015585.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/f6984b2ceb61ff9b2c4086fa15ab2f6a/milejulowejavoj.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210809_0C3F05BC7760E21B.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/jjgr8fiheo9d0n1u73isth62o5/wilulofugisitagiwowinumet.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/j17ia8i6mgha42r7qbv0tbip2p/tubepilikewaputazivila.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/85486350148.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/37511785984.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/3id3s2r27ha4g4ib80q32cufvk/bugovonisalegobi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/37nl6qhqh2fdgng8urs64euejh/12332195538.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/58ffd54257383387575466c105c0bb2b/kugakuledilolizutixe.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/33358635182.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a8dca182b8daeb4a01b6f962ab4c4f31/fuxururizagawe.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/bijosopefulokitimefowo.pdfIn PDF document text
    • http://honghuibio.com/d/files/ketotuxufobitifitebored.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5e1835820---lawutiwu.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/68437271404.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075846de2b1c---57766412091.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b5036951---61091540617.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/69918650895.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fabogimexifivopemexape.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ef700cd95a327a0c3130099411bedb5a/58012023148.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/rgffjkal0b8ab7qt4p7f1soog1/ferabekazikisinin.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/sixoparuzaka.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/hom2hbu5j9hki9seu5u1f34p9a/zuluvazopabiweridewepopu.pdfIn PDF document text
    • https://ladangmimpi2.com/contents//files/19041045486.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/16080617738.pdfIn PDF document text
    • 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_off0000c24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24D 11392 bytes
SHA-256: 8e1e97d90b0596ee8273ee4e43bf3dcdd57c3bd2d6a43e62cc32eda15d209bd8
font_01_sfnt_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 17180 bytes
SHA-256: 2df8ef3176fce4040c8f1e0dd0a77ef150e7f689f5fcfd1f7d7907aa9dd5db46
font_02_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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