Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24efe97c97e4954…

MALICIOUS

PDF

87.5 KB Created: 2021-08-12 06:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 6cbb48d0f76afc650a5374feedf3b040 SHA-1: 998cfe9e48875ad787f9d1b144d2425694c50076 SHA-256: f24efe97c97e49549ace756b7f834ecaa291e6ce104e2d4e35c05d4227f4786f
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and other domains, likely to distribute phishing content or further malware. The presence of multiple external URIs and link farm indicators strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/87607998068.pdf In PDF document text
    • http://www.biotanika.pl/upload/file/sotedabefasalanapelej.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f2702402a998039e9c8b129d9a7f326d/xepilaxabajobesubebano.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/tesizawajek.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b63dddf9---fugozogenozetixirimuvupug.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cdc0abedebb6edbf2582048dd8aaf35/foxipi.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/dimatojipitim.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/mefesewajuwagatewuri.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/jalusaveb.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077ebf3542c8---5272805403.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611460ec64c47---gizexofola.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/dotizi.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/99082442439.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/wajew.pdfIn PDF document text
    • https://stopserv.ru/files/file/wajirus.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/9h3ih5pi38o6i4vhqdk50mgktm/27933372920.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607439be70310---38050434427.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/pobekifumizepigudewoboku.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/jatomilososukopowewinoven.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/wakatazodasadu.pdfIn PDF document text
    • http://beiks.info/public/file/71605180772.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a12247a9ad6---zunufebewi.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/52372968530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=latitude+and+longitude+practice+exercise+2+answer+keyPDF 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_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 17004 bytes
SHA-256: 45a21dd394b3873832033f8c6d3e07cddbd787ad1011bbfd2ff4c8a165ddad17
font_01_sfnt_off00011cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEE 11260 bytes
SHA-256: 5a0197082e6cb2c8d5a93eefabdb3f9bfbc07a214328bf38ad166f89f6075961
font_02_sfnt_off0001376e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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