Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbdd253f9e5f43e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 16:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b7a0531aa0ef83a00dd723b8d00f01c6 SHA-1: 5e92491473522f6dee8e147965c37745287623fc SHA-256: 1bbdd253f9e5f43e116c49bde47afb25bf3e4068bf8c2bb483e9992a5fc90b38
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute phishing content or further malware. The embedded URLs and link farm structure strongly suggest a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=adjective+clauses+esl+pdf PDF link annotation
    • http://tamker.hu/userfiles/file/duxuvunakuvufajaxexinikot.pdfIn PDF document text
    • https://mytopics.it/uploads/file/34520382942.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/21435603708.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/962ca283480982d9d7a45718b45e862f/kivoleledefejipenig.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2dbb31de5---52134054082.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1e61fc4baa389b4eb7f2469e09173dff/46061595350.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/nifigavifulogujibigimadu.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/69769539726.pdfIn PDF document text
    • http://wirheiraten.de/images/file/repuxiladeguji.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608249c9e70b2---15301794462.pdfIn PDF document text
    • http://ruihuitax.com/files/file/tulivivaxomikejirev.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/15001548361.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/21b67504c9bad70dfc8daf67412fea8c/69875496347.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/62417913626.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/3755231213.pdfIn PDF document text
    • https://edgecs.com/documents/82202101199.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f3713089548b2ea21ccd9ef7408a6c44/xidasaxopu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1dd460be3---dujutedo.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/kotowenux.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f3882d993a2---71090769968.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/gefijozegowovivoda.pdfIn PDF document text
    • http://th-hl.com///upload/files/31850454914.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/ketutirefakunumojezaduxi.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/lovutul.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa12188beb---98926789061.pdfIn 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://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_off0000dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 10568 bytes
SHA-256: 0fe0490084ab228a4f45fce0a29b1fa4274c1376eb1b672c74396ece0956b5f9
font_01_sfnt_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 18328 bytes
SHA-256: 6d7259b92f433df77a7b47116c8eb02b2244efa7ecd0e34007de3a56b705cc6b
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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