Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8feef91faec3ab1…

MALICIOUS

PDF

89.3 KB Created: 2021-06-28 08:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e516ce58262e88b8ee8b30abd41307fd SHA-1: c4d29f978c2f53728c660e1ec6b120ec92b0221c SHA-256: f8feef91faec3ab12aa4b5624830710604a0543390665c45876977870d9d4fb2
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bettynblue.com/upload/fck_img/20210509/file/tegivijefoxozijamoxuzesa.pdf
    • http://amon-syotengai.com/userfiles/file/83748374174.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba57f389e---68004402026.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef90c8a37c---sefofi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609042f810e7c---24536119962.pdf
    • http://pritchardreunion.com/clients/81409/File/18557087490.pdf
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/98832013416.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/34261584678.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/beklaemamd2o5gme8p45hg216u/75034017693.pdf
    • https://marosme.ro/hirek/file/pilizadinenenuvoloxekado.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50d49ef69e---pajedabidawidemotan.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4751fc11fe---dokutonulavekuziwir.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae52efab1d2---29750671502.pdf
    • http://dajuicebarus.com/uploads/files/sufobejuzoloxejej.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/upjmo8ek1l0j3v07i9hbl52vaa/gomusijotuz.pdf
    • http://rajskiewakacje.pl/userfiles/file/kusakesaradopamimo.pdf
    • https://atamergranit.com/userfiles/file/26602009105.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa4dbe104d---burugevijaj.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/718ee40bbdec5b47c5dd549cc403b292/pukilewi.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4ff88858---xilowazuvef.pdf
    • http://verypool.cn/images/upload/File/vizejarugosimojolesu.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/9f7c66afkkllehmuv92us34l26/fuvimuvu.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/kujamixoxujiji.pdf
    • http://vhshf.de/File/60962181793.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=nepal+breaking+news+today
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb0d.bin
dbdcf1982aa7d1baefd112a0e0c24cab725a3a64180eddbeedd8b0dd4afb91f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 10976 bytes
font_01_sfnt_off0001144c.bin
64453f7f7ed65a550396f0bb91575d9be6db5d1be4577026c07219d12a5fb296
pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 16960 bytes
font_02_sfnt_off00014028.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14028 16792 bytes