Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77059178d9e1c07…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 04:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 442ae06cf562971d2f9999cb34f4ab70 SHA-1: 5224190dab5d2dfa5761e4ebe17c4c63353f365f SHA-256: e77059178d9e1c078667bf87365368a5d742b759a09b6f1ec6feeae2af74a594
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://urotunisia.com/uploads/FCK_files/file/kapaka.pdf In PDF document text
    • https://cmfnepal.org/userfiles/files/73007876823.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/25449012566.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/74471387970.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/45497604536.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/acb9144c9ff19b521a42def249684cb6/4225431660.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/kikobukovefilatudegew.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613feaccbef52---sudabogupiwo.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/17523212534.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/28191846430.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/nexinowuzedufuloxejez.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/29455918069.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/genepetufuwakadazupopide.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/rojamuwusafojafigexax.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/movejegaboloxomiz.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/03344fd6573f909a8d4eceb613dce4df/4278277787.pdfIn PDF document text
    • http://recviem.ru/img/upload/kirajelizadilijofufudixom.pdfIn PDF document text
    • https://maturana.cl/upload/file/xopuzi.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/sufudopotivadixovejemol.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/xodimuzedok.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/nanokexib.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/59556721754.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/3913838771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pubg+psp+romPDF 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_off0000b125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93C 10200 bytes
SHA-256: 0304700d8362f2e6604e6fe2e050496d0345e6fb73eb3b33e418330df863ba07
font_02_sfnt_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 14728 bytes
SHA-256: 47a6b2ba2155954ab47e529254ba441794829b3925376bc89aabeafa3d0c8fed