Malicious PDF — malware analysis report

Static analysis result for SHA-256 b013d24838f187b0…

MALICIOUS

PDF

95.2 KB Created: 2021-08-01 09:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 503c1a0c027bd6a2d6c5c817e30ebdb9 SHA-1: 862fa0fc8c63ecaa9435a90ee6164fe2b9ad1f8e SHA-256: b013d24838f187b03d24681b5335ae5f7a94fd2d09b889e91dae11de4a1ced7f
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. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/13e7706199a8a08aa531ec7b83d9d2bb/38289905371.pdf In PDF document text
    • https://yukkumpulgroup1.com/contents//files/bigomitenusasadiburinimos.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/sagilu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9865a9245---radutuxuweb.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/82870335034.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/28843193342.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/senadotuwefuvujesasaxoxi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160abf846145a1---tebunebilope.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/sariloji.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607365c598e20---31153349083.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/12020459164.pdfIn PDF document text
    • http://hevolta.com/upload/file/76453985657.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/eb51357820e8aa8edd6e7a363a1c2428/wularitilutakaxulubus.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cef38c87fa5---lenazurozoxupaxetusizeje.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2205cc535a03d0ddfa18107c1e933ca9/lijefifotilupawupive.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6440688d8---kolagemebulezero.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/fodosemesutetusofigev.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/zovoku.pdfIn PDF document text
    • http://hydrem.ru/images/file/70867135536.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/658524b6ed9237ea4176634bdc325e05/66591468879.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/kogoge.pdfIn PDF document text
    • http://ktcz.eu/files/files/3317693891.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/madapowanizolug.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/53861704956.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/rukagagula.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d21f0951d69---26303602279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lg+tv+32+inch+price+in+india+2020PDF 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_off00010de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE6 17660 bytes
SHA-256: 7f3474a7551bd1e304645f9c585034fb99c1d57453d088f3270c5f3f420a90e9
font_01_sfnt_off00013c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C80 10896 bytes
SHA-256: aec0cd02976e326f2428283b7f3c3fd3800dc92f24626514de18c2656d3f15d5
font_02_sfnt_off00015589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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