Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1a74595bb5dd72…

MALICIOUS

PDF

94.4 KB Created: 2021-06-25 03:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8f4a97415e91197a0c49d0a69b83cac7 SHA-1: 90361ccbcb4170475dac871f50d2a6a0c03984ad SHA-256: 4d1a74595bb5dd724c0507160e38a43a62ce5ab9a70e24b8e3b914f527af0985
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 0.9995

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://huntic.ru/uplcv?utm_term=harry+philosopher%2527s+stone PDF link annotation
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/e9c71c450e69df2af899838ccf04ddba/rotireduduwividixuvodi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826754de486---vinesosexamek.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b1f4d5d88---xifubogekinageliselake.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1bf7dd07e75b15e7a7bc1bce06eb9b83/87368563400.pdfIn PDF document text
    • https://webmenuplus.com/images/file/88845336567.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/radunameguzilul.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c6f098522---89726903516.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160842fb70555f---84634600350.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/n5kv9b6n2267cdivabk5cin498/45187447673.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/5nsradp622j6t8cl1rnk9f8on0/16969177399.pdfIn PDF document text
    • http://change4best.ru/upload/file/numaxeluzeveruri.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d235aa0c5d7---ripisaki.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8474a4980bd42eee70fa920dbb6683d2/vibuxozupekararaneparax.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file/%5C/nobisemolalopinaxilu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 5064 bytes
SHA-256: 3f6de1aec48a87403f10b03a083c4c45b4df4279029407cccc41234dc55218ca
font_01_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 5004 bytes
SHA-256: e4257d19fe09006cddef0d0c9f673afcb3879c3f5c632c6a3ecd50a25a68376a
font_02_sfnt_off0001154b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154B 7084 bytes
SHA-256: c2fd14632d49e51f7e61466e6c48c5a0b2e221efcf790d4d283389dad30ad801
font_03_sfnt_off0001281b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281B 12592 bytes
SHA-256: 9d3fa6e57820e419dad0f4aa96daf2520862fd2ba77b5263f69b94793f8a57d6
font_04_sfnt_off000150c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C9 17772 bytes
SHA-256: a8ab1c5a1d0a091a0d7761c5d366634b0d5dcbcfbbed71994e884d8d64abb6a1

Open this report in the interactive analyzer, or submit your own file for analysis.