Malicious PDF — malware analysis report

Static analysis result for SHA-256 77408bc67da5cc52…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 02:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6dfa70ba196b39c1743cd2f7ecf18f2f SHA-1: 7382e96258d2eb7805507444951c50b2ae8f7014 SHA-256: 77408bc67da5cc529886b32155290c285346fe715b15ad96d0cd255bbd62fd79
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document structure and URL analysis are sufficient to determine its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=how+to+put+music+on+your+phone+from+computer PDF link annotation
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62218364633.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613551312dae8---83599150704.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///fegik.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/85981544612.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/repupudatixetiga.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/buxirere.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131864ca140b---54353874849.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/giwopebibufodosov.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/47834686749.pdfIn PDF document text
    • http://aneri12.cz/res/file/91136892393.pdfIn PDF document text
    • http://bankerz.in/qpic/files/vaxamowoxexe.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/zetisifewab.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/kiginategerujezugoxodexuv.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/55295783185.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/sediji.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/70590551984.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/808ad66fee9c39451e13f9407d60a1b9/jojadej.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/kosawatarunavivi.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/xelujorulomalora.pdfIn PDF document text
    • https://majubesar.org/contents/files/9209275091.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/65710425325.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/38239185859.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_off0000cbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD2 10828 bytes
SHA-256: 98c1c397f1efd8176494113a5b8d561e1f61082e24f513c196ecd8da37abe0fa
font_01_sfnt_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 16472 bytes
SHA-256: f4a235f7082037716f53e6a4c8d137f94d081970d891b6389e09001e23836be0
font_02_sfnt_off00010f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1