Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08477b9fc18d61e…

MALICIOUS

PDF

76.4 KB Created: 2021-07-19 23:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 097e733a1375b5ea2da245915a937baf SHA-1: 73a20d567fa5f170e75dc71f96e1f6747680b0dd SHA-256: e08477b9fc18d61e7e99f8ead92170bbfb13233bbf7edd94348e39f7e8842e6f
196 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress installations and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d9896ab656e87492f59fb6c23dad17c2/61635353053.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160af61ebcb83f---91404676048.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/p6hlrfv0fia2k657i2lj3d9fr3/vejimud.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b574a85db72---ridovojoxovetotukadanem.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf46619e58---83553321643.pdf
    • http://clubmaniacr.com/campannas/file/55116057490.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/dbf99d2dac82e9a43cedff8e4f81651d/98955944256.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/o2ivbs31erqobu0o11pmnau7oa/nimuwunajoki.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160941fce41cc3---makivedekipuzomewideku.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc5a71678---xituxijiviwodamunovebek.pdf
    • http://yalciniskele.com/imgup/file/zejuzegaruparuzebiliret.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3c5c55ec490d07e28299f7e9c8740fb4/tenevabimopumexuzilu.pdf
    • http://attlas.center/userfiles/file/zosonujoxemotawewo.pdf
    • http://cautrucpalang.vn/webroot/img/files/61466889832.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/xubajevixowiges.pdf
    • https://bhalakusari.com/uploaded/ckeditors/files/5326783096.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b13850f318f---71933087448.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/942245b1475b708053b6e3f8eb801f68/10350923917.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/desuduxib.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///56110961508.pdf
    • http://banphimchuot.com/userfiles/file/83909560790.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3duflf7dp9ddn34r34ea7e71o6/wesiwusu.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/noxugudosavibo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ground+state+electron+configuration+for+silver
    • 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_off0000c5be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BE 16792 bytes
font_01_sfnt_off0000ddd5.bin
984f55288d42fe4fdcb1aec7c8f9daba52b1c41b398fcd4dc90cc4f269d1598f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 10856 bytes
font_02_sfnt_off0000f6d8.bin
10d8dda58f88882d9675b86ac94f50f4ce66ee44f8dd26795a53b9ca0701bbd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 17288 bytes