Malicious PDF — malware analysis report

Static analysis result for SHA-256 6654cd6154a43fa0…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 03:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8d9050049f05fd56657cbba445d74d30 SHA-1: 0a905c647dde7e9b8080728cfbd40d12bdbf775a SHA-256: 6654cd6154a43fa03031e45a38b8cdff6c2c04f0440dcfa8beb96a2b2b148ff8
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=ejercicios+de+sistemas+de+ecuaciones+exponenciales+y+logaritmicas+pdf PDF link annotation
    • https://heritagecambodiatravel.com/userfiles/file/takefanivumedepobi.pdfIn PDF document text
    • http://talleresjpg.es/img/file/rileluteme.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0gvm3pa09hsb39bfs0qq5bkdt/2496708020.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071702f3f95b---wuguladol.pdfIn PDF document text
    • http://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/minitetonote.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/67511348641.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/guredonel.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/80341455513.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0740759e92ace5d473d6370ecfe55132/70911452864.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jidusarunovewivazevo.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/br2n5a7hehi01ob47puovljp71/bulazarepekabazasosokodi.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e29a3868d---liditonoxatas.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0584d0e39d217b3e387e725949dd671e/52982804491.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac2377917---92826000237.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4a62585797b389ac9997ecd756e11de8/zapewidaron.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/87835224620.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/30103335972.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/waketuxosojamonetivabomi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ac7393b6d---8911032768.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9590789a4---51945560630.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/futolasezir.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_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 11392 bytes
SHA-256: 93520321cf135a2599a28cd9287c623183f80a3f809e9c69a7dad5d2cfe35122
font_01_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 18800 bytes
SHA-256: 76dd1642e590c30c9549659866a775403df19cb36baf23c68fbaddb0ecfccd21

Open this report in the interactive analyzer, or submit your own file for analysis.