Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f2b7334ef88441…

MALICIOUS

PDF

82.2 KB Created: 2021-07-18 00:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e11f194d2e2cd7c9769882a70730fe2 SHA-1: 73a109363a25be0472ca4bf52c6055256437a51e SHA-256: 43f2b7334ef884412de01623231c97bf90df1d321676d548a6977303d97731ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://webmenuplus.com/images/file/wufexemegalo.pdf In PDF document text
    • http://savalis.ru/userfiles/file/guvafeduvuveti.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/zopobanezotafex.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/segepotogetisawamow.pdfIn PDF document text
    • http://aiaciran.org/cache/fck_files/file/vogigefuxukizo.pdfIn PDF document text
    • http://bjjiffy.com/upload/zepatuw.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6691620aa---32282227097.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/jolalop.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/20046528461.pdfIn PDF document text
    • http://placc.info/up_image/37060856133.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0c1768c6---zoxafa.pdfIn PDF document text
    • http://cycling-software.com/files/file/13357032214.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607201ee99f46---korasegur.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/74836825383.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/203ed8db1bc3a207c7519b713d0359b5/23748240554.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/63745307459.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f4a3eddef---96394439718.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/nuzativuladowomal.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd35a6dba0---16159964939.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4eb75244---70606223277.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/64837239644.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/miwifilezubirukuvobarala.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/kadijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=all+in+jestPDF 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_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 9832 bytes
SHA-256: e99b89a5d1a37c1da2aa98da376b47d15637f2f72196cf83cc10bed108291293
font_01_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 17944 bytes
SHA-256: c872e8a72f36520c348b145572657cb3fffcb212fe2443dfaf722c5f348495a8