Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd59e488f034f11…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 07:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb956c9aeb92f35ee5df905af74d8578 SHA-1: f52b62bd76e91f644a5a7d5fd6a71850e3c774be SHA-256: edd59e488f034f119cc8cc3df6fbb6cb2af1ca9a0d5e0e0b2a8def093927234d
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://renesens21.com/ressources/upload/files/savovilefas.pdf In PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/vurugimeriwopopolininadax.pdfIn PDF document text
    • https://senhewood.com/d/files/77136913633.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/selikazifafavudulom.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/49988967701.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/27918989023.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/28405007586.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/86887120048.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02c89084c---vejujowobaxemuletubovugap.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc42db43c0---rebosodunodaje.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/lomikexuwemogojusowotewa.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/89294826499.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2ee37cd20dd542709860a8e8fdfffad2/nafejufe.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/moferotami.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/227576cddf5b0952e58ec2c30ff6b979/pamosokij.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210826044353_618184581.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/wodezorabivinixumoxem.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/30044015608.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816b98e2073---65497374284.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607165ef03382---11188531432.pdfIn PDF document text
    • https://aokman-drive.com/d/files/gavetise.pdfIn PDF document text
    • http://erpos.sk/data/files/84610657344.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/wegidokipobezonubozewuxo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160861951595e8---23521249080.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b774155b672---32101375509.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/juzesitejiverolufug.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88cf8252ec---tivisarivorijaxow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+green+room+book+pdf+downloadPDF 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_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 19232 bytes
SHA-256: 1c68947213e73b45597e90b0cdc3848b39437b8699b4a96642d4bfe3624d72e8
font_02_sfnt_off00012b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1D 10868 bytes
SHA-256: f8bd265c39fd93d360d85ac74ef35d2a5e27b68c5ea820260ee2fee491d159ed