Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ee013b09b478924…

MALICIOUS

PDF

69.1 KB Created: 2021-06-08 07:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d12caffc5d49c4498e9657b4e7c179b2 SHA-1: c4e6aab6203a8409fbac3776b580bb6f3e4b8729 SHA-256: 0ee013b09b47892435e715a3fdd5e785f8ad504c9ae93d292cdb2385c5301981
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing pages, a common tactic for distributing malware or stealing credentials. No scripts were extracted, but the presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=explain+the+difference+between+adjective+phrase+and+noun+phrase PDF link annotation
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076662beeb8d---zadelala.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d861cd99.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/aa8f0562f51c0d21fda123ae30b60d48/xumoz.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/59922631419.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/37829065563.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075649ae268b---83475658196.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/76ccf436b19f65930386024d4a963cf4/28237107055.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f785b524e526c042ad9ff6adca8860a4/funukulezeweke.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/0e7f204f95bb75b67ca0aaf7d3b89151/fulowavav.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4122b361f3---muxisunimoz.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/o0fuhreldr06c3pdl8ctb9nstg/mumekikakanepe.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16486941e4---18071270472.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD102 5636 bytes
SHA-256: b20ce245a87c02b9232f92455707452d1ead33be636da598b36eba517b004b49
font_01_sfnt_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 10368 bytes
SHA-256: c8c80b56095a0501c93c8e3ee5ec082cf8e65dd24faa9aa5cc31c6df12c31bfe

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