Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a141bb52c9c93d6…

MALICIOUS

PDF

87.7 KB Created: 2021-08-02 03:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f04945db42c7609bd413040ff0f4d9f9 SHA-1: dd34fb27279f3c7223ca7d6132f9c0f87210dada SHA-256: 7a141bb52c9c93d68d008ec35e1ecce0624bdcd1a7859393efafa3a1dbdfeb7e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests an attempt to leverage these for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://alquimia.in/admin/fckeditor/editorfile/norelunezenozadepaji.pdf In PDF document text
    • https://borgopitti.it/userfiles/file/30937675541.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/76370cd71e4e65970e14e6915f3fe85b/21877512688.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b86dd1a1b1d---saxitogakipotamilabewatow.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab911c021f6---41641933819.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/60652641000.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/71213281419.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/11561949127.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/midilovesurugonupube.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/kuxurojibileninoduperofu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ba0ea7633---mimen.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af6bbde07---lukadiwinuvumovuteb.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/27861710071.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/41322214060.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/93952915267.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/tosudowogefu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160809fa2dd14b---36908912595.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/jamaluwuxuvutap.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb802ecf8---29901339017.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/98803920057.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qnhv0njls78bnn3f7vj48nsq8j/7011429168.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/8999974937.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/82962366462.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210728063020.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e32f358d---zilojamebetewefewal.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/13891915425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=adding+and+subtracting+scientific+notation+word+problems+worksheet+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 16496 bytes
SHA-256: 304456ff1e3969980e57dd13e94af4b7abac2220e6e3c3d7470846983622b7e9
font_01_sfnt_off00011c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001348e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348E 11464 bytes
SHA-256: 84d3352d14063d1a7a15764effe228fbb6716f4961dceed6c95c3c47a0ef91fd

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