Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff0cb4bb44591a3…

MALICIOUS

PDF

75.8 KB Created: 2021-09-19 02:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d0788de7a6105e1be4ed7895a49911b SHA-1: 8a05f085848dc9c49705a608c4c5c6efaee58f6c SHA-256: 2ff0cb4bb44591a3ad421f768c81f9c51ac7dde95e159c8e1497d6174547ac17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of multiple PDF files hosted on compromised domains suggests a campaign to distribute malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zssadkowice.pl/pliki/xitibitolepejodi.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/157295ad56b5cdd7a36ff0c0029d5447/26471443468.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/mozumubukorofogajavunit.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/soparix.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/42539569535.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/xuxonarenakokufuteb.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/48773043000.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/bafamanipuwikegevol.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/bekapa.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/degijewopovukisidipebati.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/42075553049.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/dunawadafedimanubaxaveka.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/pomabudefupavul.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/24863686982.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161444f8dedc9c---bunoguvugis.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/vaxorinaximukixuzoz.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/15987640573.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rawijevojaje.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/19167634666.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/82r79en76rnb1b5ag0ece5r0qq/66385669298.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/xamuxarabokivetukemujagut.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/10773323039.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/womajoboxelukovejam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=add+google+maps+androidPDF 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_off0000c773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC773 16432 bytes
SHA-256: 8b8da802b04166245d43cb64f298b68ff8d3d6061812c40baa7d15b377354a6a
font_01_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 10616 bytes
SHA-256: 8c44cf57ec13efb18681486ba4e15dcf10a9f79f0e3c9e41fdceee2c05f713d3
font_02_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1