Malicious PDF — malware analysis report

Static analysis result for SHA-256 275b77c5dec1aeb7…

MALICIOUS

PDF

77.8 KB Created: 2021-09-08 10:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: ab07f0ab80fbe64e068c2d40b9e9a6d8 SHA-1: 7be418b61622b9ca04200dd1db986a066f008c70 SHA-256: 275b77c5dec1aeb783caa51125ff61b03be2995e8b94c44a697ecab2788a484a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://metabolitplus.ru/files/file/66927744965.pdf In PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/8d2cf4274af3675e8b607ad9f9ff3b4e/98001070286.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/meliriwudajaxebefude.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/63835551576.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/lalano.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160911f42173dc---41795148991.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/juwofemirawoguxol.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/c9bhuov5mtddft1j637oubdjc7/74889578320.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/29400051523.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/rigipamu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161118dd33953a---kesexusiruwireroro.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/905f48a1dd087553012c1b95a5592523/54397014197.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/savadisunigelemopanajoliv.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/49370964642.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/pejajutalewulosare.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/45354437528.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/25579042930.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/5995568488.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/99263108724.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/ritilin.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/bumobu.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/33690400742.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/poberezuzufipoge.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/vuvopapuwijivazukekoboxap.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d45e6957fa---40586918693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=breeam+uk+new+construction+2014+technical+manualPDF 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_off0000c937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 17492 bytes
SHA-256: 517188c801b12cd24545887594fd46f231ccf33ffa78e583abc77123a279553c
font_01_sfnt_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 11200 bytes
SHA-256: 17668b75179f4fc40c85ddb2c6d0b254cfa85642ff94e63569c7b42e2337dd2d
font_02_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1