Malicious PDF — malware analysis report

Static analysis result for SHA-256 7258ddce54da9b9b…

MALICIOUS

PDF

67.9 KB Created: 2021-06-22 15:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2e6ebd7efd8dca99913dc0ea7d010a43 SHA-1: 67a62ada0857d1b3ce60e96715a242d17feff1b8 SHA-256: 7258ddce54da9b9bcee863be2ae83f95216ce61ffc32de84bd258cfd1298a7d0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a16fd5e280ec7558a7a83b5f135899b7/8013538341.pdf In PDF document text
    • https://samavetpharm.com/userfiles/files/83543987294.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/lotiwusapogodinaze.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071b2e5aa074---gewego.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/momexirudewiruzegoboza.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/nojumeketukidogesodit.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/1394b5dbb3450ca16153b7e65f1c0f79/38026275863.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/55591978415.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/denivaroxezan.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/42021611898.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/diwifitudumejop.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607747f663ad7---kumazexigowulonitij.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/47339629740.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/favesedojodogesesan.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ho0mvuvbul14g67mt55lk0rrhp/80935368110.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=multiplying+decimals+word+problems+year+6PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE7 5768 bytes
SHA-256: 7f6317ca0dbfd2ebab7b7048a1c3e46873a2b0ed8b0cd06d6962f18691b1e77e
font_01_sfnt_off0000d084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD084 10424 bytes
SHA-256: df3ef72cad29c208a03b5b32e5ba6e4ccb155436b5b2115a724b676045674279
font_02_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e