Malicious PDF — malware analysis report

Static analysis result for SHA-256 351c339c93c28d4e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-10 20:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 27f1614c9bfc14a9b30562eebbb6542d SHA-1: 8f53d9644574f7b77f0407d3fe52610df33c994e SHA-256: 351c339c93c28d4e88b5e970fd14eb1594d6449180e8f5ab03a106125f1c1cf5
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 0.9951

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://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f697e0f5dc---bewevezagowokoli.pdf In PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/48244818158.pdfIn PDF document text
    • http://villkasz.hu/editor_up/9495912758.pdfIn PDF document text
    • http://ciskmv.com/css/file/mumigotadinotizijebarero.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ef8ce71e---80694552789.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/xezuruwugageku.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6aba25b1a---pipafesetozo.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/5835076526.pdfIn PDF document text
    • http://tavio.su/files/file/mepotelelifunemalo.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/zugatofaxe.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210909160349.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/gigukapowabewonazi.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/78265812767.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/23401737671.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/38622974681.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/85304376813.pdfIn PDF document text
    • http://dongphat.net/upload/files/75831173978.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/19683652535.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2ef74e336---jokivuvuxen.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/16029826204.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/52412528552.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/nejuwi.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/47655548860.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/wenabebajotunofokixagule.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-10/20210910235735473831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ctrl+alt+j+chromePDF 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_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 22444 bytes
SHA-256: e3e690043847527a90d09b686e1ce4efd5b9ee545885750aaecf04699e7a8ece
font_01_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 10292 bytes
SHA-256: 90fc25ec5754f11ffb4ff86667dfc21da7f581cf7d8570bf8678984223d12cb1
font_02_sfnt_off00012dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1