Malicious PDF — malware analysis report

Static analysis result for SHA-256 c034d20f770dcbb2…

MALICIOUS

PDF

91.0 KB Created: 2021-09-06 16:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 315ab49c8db683b79f2b292077633897 SHA-1: 432d0cf7f9efd37a39fed1eb152c98f23396dbc6 SHA-256: c034d20f770dcbb2e8791980bfa838f8341be0fafe879f971285b66c82f6c46c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting domains, suggesting a phishing or redirection scheme. The presence of numerous unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9aaee865---6895570987.pdf In PDF document text
    • https://latework.cz/soubory/58895945225.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/narademalitekir.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/28650910483.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/28490238024.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160788275dd66c---redapokope.pdfIn PDF document text
    • http://adveotec.com/img/file/98836968989.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/dagopuxogevikuve.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/sizalisolowes.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/wotesukiwabilinotepoxoxek.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/15443780932.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42c5c1ba33---faginided.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/44428162347.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/rudozojuvigijovosozadupij.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bfdadb1ff8b677107d13cd8e06858794/popenejagunulogexezuremiw.pdfIn PDF document text
    • http://megalaserasia.com/upload///5528237869.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6d59c75b5026cffd8c3739b086daa95a/46290278471.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/176b20d5ccaf9be1a58b1b790dbcdb5c/54138529168.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/25359650398.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcd4a388d8---jowisezilaworalavitar.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/29078904064.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/20934895672.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210608_101755.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/falededajirozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=definition+of+religious+extremism+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_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 10884 bytes
SHA-256: 0de5d09241b635b0419eb35c2afe0b3fc46dd222a207cdf74eac1a31e2aa78b5
font_01_sfnt_off00011171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 20280 bytes
SHA-256: eddef529759f53b44a8e1a7c0eb6cb3a3b65dd65da41976fcac11000ed8ffdbe
font_02_sfnt_off000145fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1