Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b5784cb14014a4…

MALICIOUS

PDF

73.0 KB Created: 2021-06-30 06:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3772a78b9aae288e20a1e56ef73650b5 SHA-1: e1ba563f96d1077e025f3f0d74b0e64228de0675 SHA-256: d4b5784cb14014a494eca4123fdb75da231bff5c433851120c8d3a5bbd09e324
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a5427ac7---52582400787.pdf
    • http://ankaser.com/userfiles/file/49544925514.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef72675984---xelapiguvalimid.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bbcd4334d1b6c6303dd4bb572adab17/34750356718.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/82570e794c1c93f1e0d055ed8c902bb9/toxupijepetisivaxaludedu.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/refujunuxitemawofuwimetuz.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/0339787e4b78e3af07a352c852a2ffc7/27645420843.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/4cbd73ee1ea250358e2cf368ca585053/56263120864.pdf
    • http://hesexpo.com/img/editor/image/file/33593608553.pdf
    • https://betibg.eu/webroot/img/files/63436904192.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b473d1b73ce---telavaloteju.pdf
    • https://abugfreemind.com/userfiles/file/92827560324.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802c72346d9---60995526107.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/ef0207126b37c6957c613ddf40b5b85e/mosixesosi.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f432e0c9f---megusifuni.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7306959e2---tutote.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bd253ed98---66205824729.pdf
    • http://lhs1965.com/clients/880801/File/91466130200.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5e4359f9b---fiwodabivibowobizodini.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/hkqvig3q68r018jp02g0dtoj32/sanowavudijivabepigi.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a18a81dd35c---nobagato.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/japisirepavanatu.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/sedililaxa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=healing+codes+for+the+biological+apocalypse+pdf
    • 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_off0000bb74.bin
2b3a5820529a345f059aa119d217758882bf09c535a8422be66d0f10f4063498
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB74 11144 bytes
font_01_sfnt_off0000d4f0.bin
b5d58c4969a3883509be1d72d4d33a82c420c695ba5f6ef9017be4c2a1578abc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 16056 bytes
font_02_sfnt_off0000fe46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 16792 bytes