Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b55c84d95259415…

MALICIOUS

PDF

93.8 KB Created: 2021-06-29 04:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5bdb7a6477b2569cabd9ab5ffadc960 SHA-1: e91f56a5cf9e4d887684d6c2a49ec4396065de9f SHA-256: 9b55c84d95259415b464c5557db6a55c687bccff89d1a7dd6dd65fc0d5c2d401
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially malicious or phishing content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/1401a0a70c599a560f8b4bc004558002/dodikovibusufipudedubip.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/8eec6356570528233a0a35c6adfb2071/molerowimuvikanosiru.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becc4a3f435---tifagolarufoverasamuzej.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/20816c6a88a5a19642b6c7448396750e/pevamamosatanodos.pdf
    • https://basisnomor.com/contents//files/76985631113.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9c96go1cdkgmcta6ft6fmuqkq3/fafisenesazur.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/712ae421e61bba439690282edffe45bf/5858388617.pdf
    • http://alexlunacoach.com/img/editor/file/65094457305.pdf
    • http://asckhn.com/acskhn/userfiles/file/61224316126.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/93e5bc86aefd2b5aa78109182d335024/45899783978.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ba2304026---kadovasilemagakisotev.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/60225989061.pdf
    • https://aydin-elektrik.com/resimler/files/25957844654.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/isamlns7u32qsdehdi2m8pulqm/golikavopaf.pdf
    • http://duonglaohanoi.com/userfiles/file/44006852129.pdf
    • https://ka-base.no/images_content/file/72275736871.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/2b36ca797b3ddd92657885f933dda342/kujumeza.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd12e63f04f---zizinibejikibubab.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080300c0eb92---gazopajinun.pdf
    • https://alakharia.com/public_html/userfiles/file/44652847675.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef69314dd8---8819437222.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/k21lpjplm4t2j2osliebueddlt/merimumadosob.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ma+education+books+free+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb6.bin
cd63913523b3ec8119cac1cf220e38c3c5bf87bbc1d613f47b122f57df48cdeb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 10880 bytes
font_01_sfnt_off00011503.bin
3c4ddd9a46287000d0e2c24dcf10143d737a646470b96edce0d6d3f16dc3e9b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11503 2416 bytes
font_02_sfnt_off00011f5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 16792 bytes
font_03_sfnt_off0001376c.bin
0cb69986820b7e8a8aad26f316a3556867194d776e40e1519787e797713524e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1376C 19768 bytes