Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ed947eb930939c…

MALICIOUS

PDF

95.2 KB Created: 2021-07-24 02:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 977dc3d33edbeb717a40014819b940c4 SHA-1: 688faf2573f9cb13b14f7b3927f4af4516451162 SHA-256: c8ed947eb930939c7815739eb402284308ac5f744f9ca678db41b46d6d95bd7e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised websites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d5bb59c9d---70722203115.pdf In PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b4029e09---84664800492.pdfIn PDF document text
    • https://cooperspick.com/files/jozubiniladisit.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/43956603685.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/50752730045.pdfIn PDF document text
    • http://www.asslar.de/downloads/nawufuporegefokaz.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/092104385530.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0hmom8m8neg9rh4oj2nremmb54/61482542577.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/bilufusuxikofarapobi.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/e0481323daa5019cace9380a25f2922a/josezurilakiwegiwaxew.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e965b620e96---rekivubojonokumipu.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/xexuveder.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/3890212775.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/5494790403658eea1cb1dc1e87f8f208/57815101733.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a7ad0497f6bc2173d71748ef5b3c2f56/xolijo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16092ce9dddd11---92750441190.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/40347004535.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/35903829295.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b81b07567d50f98c73e7a3c5486bf3e7/kuzagomugaf.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/zajixatosimobovaniwevo.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/27726742685.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/90439844825.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc2025aafe---ramabaxarorakisut.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/wopusaw.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210619191747_og8kgu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=viagem+espiritual+1+wagner+borges+pdfPDF 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_off00010906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 20300 bytes
SHA-256: abb6dfc876a41352010bd93f44eaaccb301b6121774b4e5f5f854b3e156174a6
font_01_sfnt_off00013af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF1 11188 bytes
SHA-256: 14e8d59f80d8f52d6c8e7e391bbcb123a5baef5787b639871acf9020ab93cc9d
font_02_sfnt_off000154ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1