Malicious PDF — malware analysis report

Static analysis result for SHA-256 6487ec07294b736a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 07:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb707cb1e6daff4ce6b99936269b700c SHA-1: 82a44debaa368b717758e1463ad3e21c8fc2524e SHA-256: 6487ec07294b736ab0111680e80c823ee4f78062b0c3403cb6d52abf5dcd7c0a
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the nature of the heuristics strongly suggest this PDF is used as a lure, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7219

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=why+is+my+keyboard+lagging+on+my+android PDF link annotation
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614007bb9acc5---fajesojubaratukobiwaxesu.pdfIn PDF document text
    • http://texmet.pl/userimages/file/2052473212.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/mepafopibagan.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/88698590486.pdfIn PDF document text
    • https://grancom.by/upload/docs/votaj.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/60445544321.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/93898918935.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/21829410276.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/93281902874.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/75835101625.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/nexikorezel.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/80834176092.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/44428576919.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/69346606695.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/35489517126.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/derimilowoxedamokofe.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/31237206851.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/xefimutemimorazoxi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412ac5db787---talepi.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/dataniserobinagomijisokuz.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/zawudib.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16147a0af4c86b---nenosaredudupotakujaduk.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/67008368821.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/67349982293.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 10936 bytes
SHA-256: 2e8a2207256009ae0b86fb0f2b0a6405747cb464152d2a252c0416d65584f6d7