Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0707dfc2ca64221…

MALICIOUS

PDF

75.8 KB Created: 2021-09-16 03:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68280f416d35c3dd05823be611a8e22e SHA-1: 5be6cebe9ac57f270c8d77f4e19780b48e730d6d SHA-256: b0707dfc2ca642213bf5fa7969b3f52da6aa2fccb9726c9d4ce1ec45cc4c4da5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and link farms on disposable hosting further supports this assessment.

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://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614273016c98e---21855452128.pdf In PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed1f583014---33738809153.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/bixivijamokibaxaseg.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/vilipipamazogijuteri.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/wamosejuxoverewutarux.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/sixiwubani.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/dijewuzagesivulowixekux.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/tosadipumodaponisupibuko.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/nidevofidufomesowexajeju.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/wobusijolegosuxaliwukomob.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/18992801999.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__61312BF0BF65E.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161401b2e9ed1f---68443212915.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/wedivufimaramutavumolixu.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/wajafonaledadonode.pdfIn PDF document text
    • http://gapp.fr/medias/files/motozijimowakimutabopuka.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/65975221823.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161408fc6b7dbc---sozezumowiworafatigo.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/xobumukusivokajoni.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/38180182128.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/radep.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/47087020206.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/3987579223.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/wanidaraxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+improve+my+camera+quality+on+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_off0000c1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FB 17700 bytes
SHA-256: ac835f5813f337bf867bae7845f16dc860fb97246e818d75050449e7f388db29
font_01_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 11012 bytes
SHA-256: 217be1306cf00bc15c818230d01d88c6982abd1238aa92c4736f8bca222ed04b