Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f8160718070f40…

MALICIOUS

PDF

76.9 KB Created: 2021-07-05 01:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52542f73c219548b3406828f219fc647 SHA-1: db1d796e8324cc5ee850846206ebe90fea6edc9d SHA-256: c5f8160718070f40652dc6294a57f9c24d136814de6f408a32c3cd5a65531bfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The presence of embedded URLs and the nature of the heuristics suggest the PDF is used to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ada83d5420e---60554376877.pdf
    • https://roshindelivery.ae/userfiles/files/74726448790.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ab3ce7a3588bc76b9fd59673338b132f/zejimazidepivesilonatod.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/921afe759f76b8a6d8593ed694367f8b/69161118694.pdf
    • http://asustainable.com/global/file/texiko.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871dcc0ab39---45860685958.pdf
    • http://au-coeur-du-temps.com/userfiles/file/jevanilafanedisozuzerebud.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e51f70130615e7f81afe603a9ba3c45e/wepinakanixasajitagoju.pdf
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/75764493348.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e098b177cb---53086498635.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/38cde989c4fbc18f0fd2fec85125db7c/15721537343.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/9epk2e8o5cl38rqndvs7v1ci83/viregafekaparisijobejuwa.pdf
    • http://kcobafl.org/ckfinder/userfiles/files/senudomuzebarapogarar.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d8841a8979a9c010ba295dfaf42e53c3/suzudavab.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1167af0bd---61288223490.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4fac39a36---25288775299.pdf
    • https://warungmimpishio2.com/contents//files/30897455168.pdf
    • http://edu-family72.ru/content/images/uploads/file/refomirejigarimor.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f815564ddd---56058543921.pdf
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/mabavefatisi.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073175144137---4979641226.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608553e3cf2a4---10462649544.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ebbe242f2ea436e22fde7b554c635a95/14502292098.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8edeb316755dfb4a4930d726ddfba842/87969656416.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852d9aae6bf---nepulorurufeg.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b966fb71823---82005683928.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=where+to+get+solutions+manuals+for+textbooks
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 16792 bytes
font_01_sfnt_off0000dfcb.bin
f788f4741f8e5efe5e7e227c8ebad93c3915fa5438b8ce52fbff4961775eb076
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 11088 bytes
font_02_sfnt_off0000f97d.bin
fbfeac3968f7096ebf736f5eeb8cd40f1cc68e604b3106efd00aec519e20ecdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 17148 bytes