Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a4e5a4b3bbd1ce…

MALICIOUS

PDF

94.9 KB Created: 2021-08-01 00:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3970e0102be98963cfc752030f574f1d SHA-1: 3dff5492955ea2a6fe9526af8cccd2a11e090872 SHA-256: 47a4e5a4b3bbd1cea619326794e0d6e8cea0dcbae5b2ef6eb256ab0057ab9871
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The 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 upload directories, suggesting it's used to host or distribute further malicious content. The PDF structure itself appears to be a lure, potentially exploiting vulnerabilities or tricking users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/50395557da6913d2e578aae526824f70/zinanipof.pdf In PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160794cc1c5e02---16629457398.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab78d3983---68509863757.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c93d8a2cf9---bifuwomobux.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2dd21e5bf---rewotixirurumepatuk.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062216432170554.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/28808784578.pdfIn PDF document text
    • http://flexicourse.cz/res/file/jepumuxugaxokepub.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071830b30b8f---xuguvugetibakorokifove.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/77809611231.pdfIn PDF document text
    • https://wagaskar.com/media/pitiw.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a9cc84a46---7872969185.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/04ff0a68e7db0c381b2fd9dd1dc7a1fc/7503290409.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/91nou5u4rf9473qd1qfpbirn5h/80978800623.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/36305561901.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/64cb71aab96441e064a92fc7f8265be6/58365663484.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/180unqdugukc0bv8gm3j15fqci/kiwaxif.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/1m87im2glrua8223lk44q0dbe6/xasisorunel.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/8550062293.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c475b7b4304---64076258256.pdfIn PDF document text
    • https://tepihtrava.rs//files/jaragedaka.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/sodapunazenavifu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807f4cf1ee8---mawabekavaramureve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=nfl+football+game+tonight+on+tvPDF 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_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 16928 bytes
SHA-256: 02fe722aaf5d5f133998b82a17f6ece15d6214322cb2fa6639c14dc4cd99976b
font_01_sfnt_off00013d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001555e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555E 10576 bytes
SHA-256: 314fe0e7e9be830e19b47c541ba3f4405a8c5cc96fdf6340ac1225c41ba2c878

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