Malicious PDF — malware analysis report

Static analysis result for SHA-256 50144aa3fd3294ce…

MALICIOUS

PDF

85.5 KB Created: 2021-07-31 13:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 388e137bab23aa9e38216b1520d5ac48 SHA-1: e12104962dd3ae9cf848482211bbb7de632f80fb SHA-256: 50144aa3fd3294ce9eaea1b3af0713c7113892a62a2f46587279487e90b05a7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=inervacion+del+musculo+elevador+del+ala+de+la+nariz PDF link annotation
    • http://mitsubishilongbien.vn/images/ckeditor/files/vasudibefonesanisupevez.pdfIn PDF document text
    • https://angkagenap.com/contents//files/sijilobuzunewaj.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/jizenej.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/rujonukadaxabufokej.pdfIn PDF document text
    • http://mega.kz/media/upload/files/fexakomekibavezifa.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0a6cf8ee---89393360065.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/4314222255.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/lasokedosafex.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/fafapetosimos.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91d83ea88---vufitoleruweso.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609d03f15be4f---41897531879.pdfIn PDF document text
    • https://unosms.us/userfiles/file/mevidakobanuleka.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a22e93f2153cc3f2a531548f2c276f81/sefumepedibokimanofel.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da30c94b38---74400774091.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/14024134625.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///pexikopexakofemofiwe.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713bfc0d0e1---39545195140.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c631bf04---disevepo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55018f39fb---38857470069.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/35058926506.pdfIn PDF document text
    • http://rld-carbon.ru/file/47483029826.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_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 10608 bytes
SHA-256: 2371d0690d54f4a8b1c648b96792376991548b64ec16599a4b39b4b4209c2a31
font_02_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 16464 bytes
SHA-256: ed2c1de3b1e142ba36f321dec5fcae6a60df6fd075e05446473a48742d418d86

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