Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb5caf3f4b155f6…

MALICIOUS

PDF

84.2 KB Created: 2021-07-15 09:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e88ca45cf4ec398290e6c92ce7d45186 SHA-1: 358d1505e3871fd96f9aaa3c1fd961ec2dcf9f89 SHA-256: 5eb5caf3f4b155f61502ce8a8b8a1e0ab0bca0f247f1880b1179a546cbb98757
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple PDF links pointing to potentially compromised CMS upload directories suggests a phishing or malware distribution scheme. Although no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jonkmp.nl/img/cms/file/terevudejolaluwe.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acda1484eeb---2343289850.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e77fad5592---18812725554.pdf
    • http://samtle.net/ckupload/files/93351433124.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1832288fc55b7b1ad74461740f500799/42333158304.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/cb1bd6dd0d9b3a0b72b57ebaa1ba7896/nidafegop.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef2f1dc03---67511472279.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b21c7914b1---xerivifanulimetukil.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/f5tb009s9tdtgngombk6trorl0/73097794127.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c7f700ecf---9923216059.pdf
    • https://thietbidienmanhcuong.com/upload/files/52829302091.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c30d45aaa763345866f013e6b95cdc16/tozatukusajobozevataborut.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01579b7c2---tuwofitibamuku.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705067bfafa---57460962424.pdf
    • http://absolutelyneon.com/userfiles/file/9378287510.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/qh2pooa2vomu7fsbl5oljflm6g/74698203549.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2678b14b0c---wiwomorugarokeba.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/fakajumiminizasitimed.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/95085600869.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/8d196da63cd9fdf448aefc126f19c838/zeminipe.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5c3d813e3c1a9308144bcf46ac885439/zexivuwuliduwexogatuz.pdf
    • http://degrossier.nl/uploads/file/23418086320.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d78b9def---dolimupavegoze.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c726b9a91b9---76934271959.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/006048af81f4435010f1fdb63d13b984/58745595187.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090d465d3449---rerugi.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5cc72105ba83264eadc9f3a5e1f67b6f/kegivifawofa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+is+a+signature+line+in+word
    • 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_off0000e73d.bin
7dd37077548b69cfe554ee1b0701eab2d9a2891c950965ab1604f4541dc96dd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 10704 bytes
font_01_sfnt_off0000ff96.bin
7b25025f6d2ce2953135c99154c7d34455d2ce6a21e7ee95c44b398cade86078
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 16732 bytes
font_02_sfnt_off00012b6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6A 16792 bytes