Malicious PDF — malware analysis report

Static analysis result for SHA-256 479d346d2d5d5e47…

MALICIOUS

PDF

71.7 KB Created: 2021-06-18 19:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c607e3208f26c6f563db968d2dffe728 SHA-1: d361b91d31a58b5a05b1745fc303b383cb0e4639 SHA-256: 479d346d2d5d5e47f8e1dc85fb9d7fd17f2d139c311cfd9a60730723875fa20e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malware or phish for information. The presence of external URIs and a high ML classifier score indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/uplcv?utm_term=skatter+free+download PDF link annotation
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/745809a4b11648833f641a77a719fd06/53248482305.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/52927628283.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/kebesofudarinemudovo.pdfIn PDF document text
    • http://hibertek.com/image/files/20210609_044331.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c707562d774---woxumubizitonegabufelo.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/nokuxemakokaxezupolixiva.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1f3d15fc8---zetokeredasavosuzenaroz.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/70699414033.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/44045ec0e86e000f7b971fec788273d9/16638301800.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/29342491139.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-6/20210506060046240508.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/43773058798.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/tixeritigabivotunenetinaw.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eacca4ad45---nopesavisaj.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/51599739046.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_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 4980 bytes
SHA-256: 5a025ac6f005619d272be6e3637f3dcb8f6573795d55772679a3b75393a26a71
font_01_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 10660 bytes
SHA-256: 8db27cab2c65fc7edb7eb657f28c29bfa50288aeec984f247aedcc05834ca807

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