Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a98976107efc54…

MALICIOUS

PDF

75.1 KB Created: 2021-06-24 10:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5178cbe1ce86092ed7fdcf7bea1c3f40 SHA-1: cb2bda75234f8018cfdb907de9c72ec2f47c8ba3 SHA-256: f3a98976107efc54ca3ef008ce3dc5f409fe4d3d4a156f7ac4d41cc7e2411b14
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, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user 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://synerhu.ru/uplcv?utm_term=crossland+x+navi+update PDF link annotation
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a84ebff4cb05f60bc013ec6772153c31/94288017781.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/bb1a6e86d0b10f1c3b30d1522163cdeb/6624635212.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/qfo5k41rv5rven0kusp9nismml/37031938780.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/69369733089.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f362e3a72e---33477456774.pdfIn PDF document text
    • https://noddy.nu/images/file/tazotileduwa.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/sugasotixeparofufegobal.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5850a81bbe5b54943ae434e92577337f/vapimeji.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72dbceed46---79393328684.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tg3f6uae396d3ov75ltmsm8uc7/48476300248.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/viwavewomisajiliwegunuv.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/95844267428.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/suwofile.pdfIn PDF document text
    • http://topas.lt/userfiles/file/64451816730.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_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 4984 bytes
SHA-256: a2eef5c4fd8e6f24021e319b93790000d45d160fe233886c5b07cfe5c83f22a6
font_01_sfnt_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 12040 bytes
SHA-256: 2d5b52727626793262cf4aa1d56b2ed078a9092dd06240b85c28d7a8c5c4360e

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