Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1d8abf4493a699…

MALICIOUS

PDF

84.9 KB Created: 2021-07-05 06:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8d23517c9160344b066939c3457fc949 SHA-1: 2329f204e33cc2140b8f9cd5c7a5f91324f90a57 SHA-256: 0a1d8abf4493a6998d3c41ac1bc3aea57f0b98412f4b4ffa70b41358be7ba95c
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress uploads and other sites, suggesting it's used to redirect users to malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely phishing or malware distribution attempt.

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 https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/441dbced1bd6792e59802e7b0a3a9bae/7931019692.pdf In PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/d505bd31d4b2eb6d08d41a0799745255/66140531904.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/iufkmdjq4rccf8rlv8ed94l5hs/lutedimoxajujudetuzoke.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075766d68c3b---28458333285.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/73915442599.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/37061787674.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/fjbea4m34qls1kpcc8oru6c8hj/vowavagif.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/kesadekitabefopatetibebo.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///9049429035.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/dulewuserikijofomu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3bb96496---57371276456.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/feririgawedudezub.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/8eedec57e670622053e5902d3b546eb7/61517137780.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/vutol.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/29505459189.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/daruvubitajoj.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/c7c8ef2295f12707f772ecfc5bdc6284/10199375907.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/23eb09154e4063ab126ec9d2d8a7107c/gizamevuja.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/ralapufuluguk.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/gogizulefizit.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/gonusijitupamobolot.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/wawowawesemomivojomaz.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b256891abc3---ridusutavawuxedogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tonsillectomy+near+mePDF 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_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 10468 bytes
SHA-256: cae13bca3bd846e90490c1c24be7a1b175a8811a540eb6ac13ec782364948bc0
font_01_sfnt_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 17012 bytes
SHA-256: 0b361e36823e72aba0183a4ba6c81b6d1d0b27c41ffbbff46eb70859f8669e04

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