Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e71418dd46b468…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 00:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5efe838f2fcb658b9e6fb014e65458e3 SHA-1: 2a568d0f2c7e9c37dbe0f377043b45eed571a3bd SHA-256: a1e71418dd46b468cd21b7956fad433ffe94640c51bc6f51b6c9c84b8921c144
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a link farm with numerous URLs pointing to PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The presence of these links suggests a phishing or social engineering attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://akicgiyim.com/userfiles/file/kenomokixafibul.pdf In PDF document text
    • https://bluza-shop.ru/content/File/tumorazemeteletip.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/41561872033.pdfIn PDF document text
    • http://ruihuitax.com/files/file/jezijagogakuwuw.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/dc4bb9106bae29e09a13731a756f0a70/zasalufapofo.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/89641290006.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/wibarevoxutotux.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f9649e5945fdd0f8c0e04454d8648136/xidife.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa072a276b8---57510757821.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/09b4c2de616cd2c14eb330f09675f6cf/jazitawapiwimi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f937e760---golininisaxafoka.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607abe11becbd---48200802193.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/jikuberupavexa.pdfIn PDF document text
    • http://sbkf.org/files/files/dewolofudopowopijezeze.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/7ae7a0813a2a3cfb86f9baf915ff3504/dolofademosinexizal.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/1261153062.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/60101295256.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/vunagane.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2skpot7c3ggnq0unfqje2m73ot/favojabotula.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/53760212599.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/34013737793.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210622/2106221845303129910zyl4vm8vzgf.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/80886914875.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/funekus.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/bekedejomobanoduxezo.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c067bb56c9---99514651065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=amniote+egg+worksheetPDF 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_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 17420 bytes
SHA-256: a0273e158a81e57530b81c20a81c3de7332fafef39d7b97f3bc6dd8476f98982
font_01_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 10504 bytes
SHA-256: db352204ddcc1d0e0ddad293046f5d51accffd169f6351fb93cbbad79caf30c2
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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