Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b2e51a9229ce0f…

MALICIOUS

PDF

106.8 KB Created: 2021-06-25 17:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9e8c08973981f9d54dfa8c237db47d9a SHA-1: bd3efdfa7213238a2a0ffaa75eaef29ce54eca46 SHA-256: 85b2e51a9229ce0fd5d6fce8101ee7230745977ada1cbe62d759c64fc0096100
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to PDF files hosted on compromised WordPress sites and other disposable domains, suggesting a link farm designed to distribute further malware or conduct phishing. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://garglob.ru/uplcv?utm_term=chow+mein+and+lo+mein+noodles PDF link annotation
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790c346ce57---96051764476.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n6enagk26lun1t47gkfahl05d7/tanufek.pdfIn PDF document text
    • https://avenue102.com/uploads/file/fuzut.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/80579786583.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/lofakarolarivixisoxerug.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/kosukukiduf.pdfIn PDF document text
    • http://babamoleskine.com/files/file/44380928501.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/dd691e93b32cc35ecb08c0151972e2c1/78149527291.pdfIn PDF document text
    • http://ubest.ru/images/file/37261400249.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/71206528864.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b613c64b9---4555579916.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210611172553_2075608346.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/0mtc2itob3rv0di946frnml7h3/tojiregozur.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861be89edc1---natuvav.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/47958147600.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e26e8f15a---xazelotojurofole.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a47d6a66ae7---mimokalibuduwovagagi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dc36d9088---99603468551.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3c2b2222cc6f3295aeb9a473ce034f97/99543515562.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/df2d78aee035b6a2f4c7cd9f16d0ca2c/livedopevane.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/nesubewipebatogen.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/bokokutebotolo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26f72c87e7---semokaxepiduzim.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C81 2336 bytes
SHA-256: 9abca5c52a9a36cf1de7adda162b91c9574eeb5c43efede47c1beef34e41211e
font_01_sfnt_off000136a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB3 21648 bytes
SHA-256: 47dc4bd1963e82884ca38e7f207d16376b669d2c1b6bbd86ff41341937c51b86
font_03_sfnt_off0001860f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1860F 10432 bytes
SHA-256: c0a165fe9e6aa350bc4aa8ba72c2fe0f622967c2e77658b8591c2ef8e46e741a

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