Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e0b6a8ab1e7e552…

MALICIOUS

PDF

84.7 KB Created: 2021-09-10 10:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35cf3024448b911b099bae75563ee61d SHA-1: 9f2198becb9ede25af06f324f27d98c40d5eaa1d SHA-256: 9e0b6a8ab1e7e552ed7c0e2838b30a7cdd75e96855302c7f52a353303d83dddf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. These links likely lead to further malicious content or phishing pages.

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 http://devitohomesorlando.com/userfiles/files/muxixarixomutulalevi.pdf In PDF document text
    • https://auto826.vnpec.xyz/uploads/files/sekuvivudufelanepa.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ede668886---tonugusol.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/niramukudekivomubar.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210901064913554.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/5512084032.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/52809391658.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdfd44c3e4---24208133781.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/fatezojomuz.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/lefazogusezigudat.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/mifijojav.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2ca328973cbb40b577a0916ac476e082/17701822777.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/tulededik.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/48702391439.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/wuwitamepu.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bokoligodogil.pdfIn PDF document text
    • http://yuha.be/_files/file/vurojikipinosineb.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/61611114546.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/74694961669.pdfIn PDF document text
    • http://keramann.ru/uploads/files/lutipadawisotajazojalok.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/87627844270.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613abec7cc566---72645421265.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/wowumazaxelek.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134a7e4f3ce7---parib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ielts+writing+task+2+grammar+pdfPDF 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_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 10968 bytes
SHA-256: 9ebdbdae0e034be92bcedbed298368d8e96d37bf5025805001c64f77ec77d1cc
font_01_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 18784 bytes
SHA-256: f8d0cc8dee84c8280d3121f512912b5c844678a0bfb08e4c96b640a6fda26112
font_02_sfnt_off00012d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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