Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf4fb0c0bd3218a…

MALICIOUS

PDF

98.9 KB Created: 2021-07-15 16:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 795e43c67c603abe403c71b8ebc55899 SHA-1: 2f7ddd5cb70a5171490ab56eda67eff7cb53db5c SHA-256: 4bf4fb0c0bd3218a8089c0d0cba14df859cb9911dab24f4deaedcee6f7ca70fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage distribution or phishing campaign. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an effort to obscure the ultimate malicious destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9374

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://laborke.ru/uplcv?utm_term=to+deserve+something
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c84caa5abcd---52129922333.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ffae779fd---35117477993.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4d730201390ef4af8188489a599bb85/86164548705.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/iikmv0nm0dlrvlr8cuji2kt7e8/43158350410.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/gujoxejanezasefukavusew.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ui771hi5tad5udqg3a5mt5gq7k/93302397133.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ok4ttlu9lsj4h97dc09om2imd3/milefiburob.pdf
    • http://jfac.kr/ckfinder/userfiles/files/tajilafenagawajetogilulan.pdf
    • http://amdind.com/userfiles/file/rigumatapivide.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c644c694b6b---siwitutepexukofetidakawe.pdf
    • http://scandirent-new.ru/uploads/assets/file/7132193728.pdf
    • http://k1a.ru/images/files/file/wukosogonazeraf.pdf
    • https://tecnicadovolante.com/images/file/binira.pdf
    • http://teresachild.com/upload/files/warifanilizuri.pdf
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/8hsdgp50asbnnqqbfobi0r4k3n/pedibenuli.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee5b64bba---watenijotetabijol.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c69a48dd512---sisevibusebut.pdf
    • https://aneri12.eu/res/file/8521954790.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf84585b73---10238395047.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c4c349eb7d335e1259771414f1d95463/84372239357.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2eafc8c2c2fa90ccef8c451a7e585e60/37825905324.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb3d71c1d---96118338714.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6240b52af---rozegega.pdf
    • https://jackyrouxmethode.com/userfiles/file/29945775548.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b701f4c8a3---sugorunaguwefoxojur.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb30dab094---51027006358.pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fca5.bin
671b58507aaf7ad0a8567f8330219841e4019af2b3cc00d6db4b03cc067fd935		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 10516 bytes
font_01_sfnt_off00011435.bin
cccca98374ba6cfe551822aeb941e0aea8bba81191a72f12958657ab08e957e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 18396 bytes
font_02_sfnt_off000143ab.bin
17c50225ef52bfa0bbe1c11eb2f170d4a8424447b22f33a3a9ff8ba87cd8a4fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143AB 1928 bytes
font_03_sfnt_off00014c99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C99 16792 bytes
font_04_sfnt_off000164aa.bin
1a4d4d91c3b4f02b2105e3f85c316927ebd8bfca61dd2e6c5f4cb8f232a55a71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164AA 17004 bytes

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