Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8a8cefacb0d68e…

MALICIOUS

PDF

79.2 KB Created: 2021-06-23 22:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: cf93837a0a7d5d6afda9c41867c4749a SHA-1: ccfbe504a867fbb7944b36a099c78991764333e5 SHA-256: 1c8a8cefacb0d68e6c338d6459109099a9567f872daa9cbd12fd26d014a9783b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/76cb738bab754f17c538db728db23a3a/68192074854.pdf In PDF document text
    • https://bhsbeacon.com/FCKeditor/file/39958324590.pdfIn PDF document text
    • https://atl-50.com/files/file/86900198071.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2910966be7232290e1b9afd85daed0d0/megixopuravabupi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5f43f729---mifimanivobamubi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c7994938301---99923752319.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0c8ec92ed09f0285eaad381a0b77e615/78017619381.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef568dcd6a---livuzizuriresoligiva.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07fa9273f---23814450793.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a5bd04e49---rewukajumonabikewikot.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/148562ce9bdfcac5520a4c1c5c11ff2b/21368522818.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/jdm6revtgi7d5hcrbo4spgbiv8/vimepivabisaxa.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a643206e6a8---mupufuvabusopapev.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/wemipibuduwun.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210614_F6ED229C6A7157C6.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a97277c1ba5fe30488464073896502fa/96421480872.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dk58d5liuptftu1dr250777960/83521215328.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=desert+eagle+gel+blaster+assembly+instructionsPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF9 5360 bytes
SHA-256: 6472c3661fe701543765e495f07011b4d1fc019e3b1df731f66f81223e549b79
font_01_sfnt_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 3168 bytes
SHA-256: 1594041b526936c5ea7373f34c742a812d673167af3e1eb49eacdc34518b0a21
font_02_sfnt_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 11056 bytes
SHA-256: e88d056812410bb2efa682c7b6080b400120904ea3c39302da475133fbb60ab9
font_03_sfnt_off00011548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 16772 bytes
SHA-256: dcbf709d27b2c413cc81b33fd94f57bcb53d3d03d137b25ae805889093d1391d

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