Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecf0ebbbf6983e1…

MALICIOUS

PDF

104.3 KB Created: 2021-08-09 23:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 621d2c78d1c03f96fc12f2939fdf0b1e SHA-1: 886a93a5c5535510ce67816014c8083b2bfc067d SHA-256: eecf0ebbbf6983e164a15da65fcd584ddd4afcd73c0311090dc2a3abab4b9284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/471ede3d1c1d61cf3421bb075bfeb866/31995437144.pdf In PDF document text
    • http://bettaletroom.com/file_media/file_image/file/44907149467.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/85208711200.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160da1aedb15f3---48385454722.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5be7d5bf39d9f4ad4332602708a8a5ae/zenonevivabi.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/50801790840.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/mexafovagolarax.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e17d8d866f---16843923292.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/17456544540.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/tudazigesosakadewewako.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/62409954193.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/repewalagutori.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/45akbtieah581chjro2gdikg38/sevamogiliguvuwulomexi.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/85717485755.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4edf420019518ddd2230e5c32662ccbd/40906696067.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/8811460349.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/99626932202.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/baxebede.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1e8bb2972---nokalojopegu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a0e3eb58---dodebonev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e213444825d---69458225388.pdfIn PDF document text
    • http://enewind.com/pliki/file/fopezujurugit.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/57431249022.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc383d2d7---jejesavezosivule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=three+phase+controlled+rectifier+with+r+loadPDF 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_off00012aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA2 20432 bytes
SHA-256: 8d8cf6987c8083de5a396e17cbc9a4220d8f3b63b15071c8566000dfdf6e14ac
font_01_sfnt_off000161b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000179cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179CB 10768 bytes
SHA-256: fe13a75f7d734e214a21d8b33acf130f6fc72736caef5f00c119539c5a80a2ff