Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b0a82b59e32533…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 06:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c06b45478082dedcb3ac525deaba0fd4 SHA-1: a38b7b614cacc425351737e213c0a0533b682629 SHA-256: d1b0a82b59e325339d1f3cf6b7abadd486d1c84e2067acaa50a9972adc19a8c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6dc53f16c162b9d081dba332c3563c71/24270588261.pdf In PDF document text
    • https://tarzminder.com/resimler/files/67192372080.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/86508805165.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210913194251741.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614902cbc99d3---riretavukoporepevulu.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/gaxibos.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-9/20210909200514732263.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/38234625116.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/pogupug.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/32099328091.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0c8c23d2---26996540965.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/tuwodadixito.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/4306139148.pdfIn PDF document text
    • http://glassick.com/userfiles/file/powodakoluxewixaruzojenox.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/54601747941.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e87d636f6---dazogajilemogezaxiwazuxi.pdfIn PDF document text
    • http://yjccnc.com/upload/files/wixisofo.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/peviximosutej.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fbf30287c---62992849210.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/jorit.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631013623.pdfIn PDF document text
    • https://phm.vn/upload/files/88892695697.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/zuxosowuda.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/48251154605.pdfIn PDF document text
    • http://3m18.com/images/editor/files/jatemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=five+shapes+in+mathsPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 10292 bytes
SHA-256: 393d270e1dd514570c80ebf2135de8d9828133e44465fe28712a874a6d06afbd
font_01_sfnt_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 17596 bytes
SHA-256: c698c546617c1d4d542ee7d97f7a2ecbac5cd7ad1cf840f0522dbc95a8455231

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