Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59b828c3eb60755…

MALICIOUS

PDF

85.0 KB Created: 2021-07-03 18:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad7341f905c0c8abfce8a7c1a5a0de64 SHA-1: c6399bedb87cd22f5b36961248ad7cf7839c391d SHA-256: d59b828c3eb607559d21150cd674161526e41b4f0552b4d54be55150ec9bdf82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a phishing or link-farming attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=15+f+to+c PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/123eb6240a62f7e2b38a71c8a2438de9/22235227451.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/25978267838.pdfIn PDF document text
    • http://kasargod.net/uploads/file/62404906918.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/84412812014.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/65038805506.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074adbe5d960---50756342086.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22344c1551---26296672768.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/sobuvejeborudaxixazuk.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/lokozeduxisupololu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/4j362nfncsh0n6ndibb94s5sj5/36857478154.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b199f586d14---jefiwufivisufunugi.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089c406ac75b---43448683254.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/3713777388.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a7b6314b0deabd5e3265266708ebc466/sosuvokozowuva.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/unk6om3gh8tpn9l5d65l6gmq0o/59420806503.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/tituneveba.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430071248787664.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609566729bddf---29957827801.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/39964039524.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/19206494049.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4034431f01---rirum.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30b51667e---xezawifamefepojugakati.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/23919623582.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/55dc577a7c6b8939202d2b4040aaa3ac/49884857628.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 17972 bytes
SHA-256: af36c7802b916724e36f7b66d6411cc88442e87a082d6d10440a0652ad16be61
font_01_sfnt_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 9616 bytes
SHA-256: 781a48bb9548670498f01f0061ae8909c8dfc13562872ccddeb59f1373b15af8
font_02_sfnt_off00012f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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