Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d9f143945a261c…

MALICIOUS

PDF

91.0 KB Created: 2021-09-04 17:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b2ce791044f2dcf1a896caaa397efb6 SHA-1: 5a91cbb26a3a5c4021a848366a39de0dfa4282af SHA-256: e4d9f143945a261c6a35b070e8b04fe05d69c173a9d32ca7bfc0284f687cd5c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to lure users into downloading malicious content. ClamAV detection and ML classification strongly indicate malicious intent. The presence of embedded URLs and the nature of the link farm heuristics support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160844716a43e2---63126045802.pdf In PDF document text
    • https://kurek-rowery.pl/user_pict/file/motilofefepuvofif.pdfIn PDF document text
    • http://aa-nusd.jp/sapokudazevowamanavupaz.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/6554d7f835425ff54e83aa8e8d43fce6/jegofamod.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/kesadamoxezegesuvanaxiba.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa935c785a---17615913741.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210727055854.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/wezaz.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/mepunesawufemitowegafo.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/na1atev6m07qrf9iaa4rlld6tm/zejipofavemegesererudorek.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/roxuzabena.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/64b7c8c1202f8d50eaa86646485214de/lomogamovezujasofitotep.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/22777264139.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/529b11df9e3303d38740455d08523e9d/16362892489.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/263e179e552e19a09aebc5260150aba7/28749662872.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16105296905b35---sudixifak.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/jasaguneguxivasatigeluta.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/malanikabozopudotiwilimam.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/at7on6afidd7q7r68hntkvncn4/wojidepivaxugumuzu.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/97950817997.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61cc0e5e17---bawimiwa.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d499a8526e08cd3524c9a94c61a1bda3/gogevanuzerafigudidemel.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e925a291791---sogubagabelarepejire.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/k76n065u8fi2t0ouia49lljrh9/pesuxovuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pratidin+epaper+today+pdfPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 24576 bytes
SHA-256: fa6c147ca35ee0ac1bdf9f464eabc990ccdc4fd868a8592dbe1b9e17e956754d
font_02_sfnt_off000128b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B6 16092 bytes
SHA-256: 29fa2f2cffed8b46d59586e33217a02490ad06086291cc63fb766f7e89fc747d
font_03_sfnt_off00013dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFA 10392 bytes
SHA-256: ccc898d8020f6f98f6431762a9d5d75a4579ac75dcbb28d184befc05cdd72e06
font_04_sfnt_off0001558c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1558C 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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