Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd2b00b0270d9ce…

MALICIOUS

PDF

70.7 KB Created: 2021-09-21 17:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e994420b76a78de1c1786cf1afd39882 SHA-1: 37a15629509fd1238107d6a407a6f4fb3791c308 SHA-256: ecd2b00b0270d9ce41acac06b49a9f7158b57cf59f8e8d95c31f742ffd7e8ec4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://lyonsinn.com/nbloom/fckuploads/file/wafepolu.pdf In PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/visebufexejasoruzur.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/bifuzebigudizoragu.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/33569473165.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146f6ca02aad---54397343371.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/44621459678.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/zolitegofuj.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/rupasexed.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/3004717650.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130551107d54---2517278247.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148447b6e88c---41230049803.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef47a3c2b---xidovisatuminunol.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/38476826696.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/11104433761.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/novezi.pdfIn PDF document text
    • http://levotst.com/uploads/files/39035945233.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/78473248509.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/povalisugumoparukagan.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378e675b32a---winet.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/64251944056.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/31c93242ab930b186e1e4e95495b1770/robatazasakuf.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091311574088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=snapchat+cracked+apkPDF 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_off0000b427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 15840 bytes
SHA-256: 402bb30105a079a4c75b8820ae8d3ea317e6735516bcc65c26e4c993379ef2de
font_02_sfnt_off0000f4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B3 10352 bytes
SHA-256: 49061156343905058f81f5d7ee67c574f8b0cd4ed6e0dcdc355525f1d69777fd

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