Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b95f4211d477741…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 00:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d6e18509a739854f9e835c66cee8556 SHA-1: f4fafc08c04b06a85d70520475ec3964efaadb8b SHA-256: 6b95f4211d4777411897dfcd88900536e404807856a3c4ffc6e6dba34325082a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links are likely intended to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://netcentricnj.com/ckfinder/userfiles/files/getisaguwetazubaluxirux.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471d16aca65---74275242042.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/notenorimikefege.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1965842233613cb047175f1.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/dujomudezuzokujuradogo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147a53f00de0---tazekatuzipuwa.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/48244189888.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7b4816509---likiwelazudezamonisid.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/43836567668.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/1676949208.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/bajumuzorugade.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/gemaxepuvi.pdfIn PDF document text
    • https://carlojans.com/cms/file/zilivi.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/7228801574.pdfIn PDF document text
    • https://olterus.com/contents/files/giliwot.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/xumudanobaduwozu.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/87963558995.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/marev.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136af307c4ba---kamizer.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/lixijibotaduvelerakex.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109131811194799.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/sotobil.pdfIn PDF document text
    • http://sgrdpandher.com/userfiles/file/remewaxisafutixefu.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/20845189630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=2nd+hand+iphone+6s+plus+price+in+pakistanPDF 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_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 17716 bytes
SHA-256: 748454f00dec464acff2dba349ff4b59fa662fb6ce502c3ea66699db72855c6e
font_02_sfnt_off00010f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 10992 bytes
SHA-256: 5f20373afae8e34518711a1d4c5b225771e76bfbf9c4f5d2ca095f892a030848

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