Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9f4a33d3310d40…

MALICIOUS

PDF

96.3 KB Created: 2021-08-16 01:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2cf12f3f144e820ff48444e6d8ee8ba4 SHA-1: 66696a1e4782ce111746bffaff36aa1e6ffe7e2f SHA-256: 5a9f4a33d3310d40e6be43877cc470813d6b36da1058f6f429da3d017c978ec5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many of which point to unknown PDF files hosted on compromised WordPress sites. This behavior is indicative of a link farm, potentially used for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acf62103fa---wanipekogijoxu.pdf In PDF document text
    • http://fzsvybbs.at/userfiles/file/wiwagoveposexolapejeni.pdfIn PDF document text
    • http://geose.ru/userfiles/file/60711072075.pdfIn PDF document text
    • http://quinta.cl/upload/files/gonubifasikufinutowesi.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/lamelaladusalimexizexuri.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/2b3003d65fe3cfa28f317477d1eb098c/64725376965.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/40a8b9c28234f5298c523b8ec5fa3f23/munifek.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///gimakidufusifonopo.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/menejaxiwumaw.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/92895564053.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b95aecb20fb713d896e454c98449f7c2/10594662476.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/jafamoxusemejudowafo.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/babupusiweworip.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61ec0208d---57293463112.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/613704220.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc771d5d8e0---9417254926.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/forosigiv.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/7424988319.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/82c30333da391dc0a2011cd4ddee2778/75491536678.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c8973e953---86647750009.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/rejowerujekav.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/gubalobonuwowede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bible+christmas+trivia+questions+and+answers+printablePDF 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_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 11372 bytes
SHA-256: d2019288da0f5b321a2e6195c8e037d4940d5fe23645dacad586dc121272990c
font_01_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 18144 bytes
SHA-256: d0a60dec17ed1afbc9e63ecb10aed9e68f0c015bebef04518a1181e453749bb2
font_02_sfnt_off0001594b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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