Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f73ab0eb0e23989…

MALICIOUS

PDF

75.9 KB Created: 2021-09-06 03:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8095bb0a50adb6d48b013e07029b25a1 SHA-1: afaea4cffac7545d5e6e244de19c2c6ec2e43ad6 SHA-256: 8f73ab0eb0e23989853c3ea8fe459e1cd67375e133366d45326dd1dd3f618b44
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure suggest an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://angelojrobles.com/admin_initial_test/userfiles/file/fozagosetipodif.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a526e66d5f2---70322725707.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/866685e27e04aedcec6f9574fb09759a/vunazugafapufivimikefiduk.pdfIn PDF document text
    • http://changdahk.com/upload/91314803268.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf97c806d---jijurisigemolaxupef.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/73363969251.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/dojadazemofo.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/susogopuvurozow.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/5811455958.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c167cf52239727f16b5cf877ddbe0305/firaxukobode.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4933230e42d49fa9a166e8783b098511/68973115637.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/52604650584.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/jigusazokozizibig.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/hgf9ssr4491bde3g4vjltehsvo/kadoxomuk.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161143eab18952---21938448804.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/31814247743.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/gatozugunoxi.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3cf1c484c---xadurulixezumawuxu.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/rugilebekejetonuvodadaf.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/61077675407.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0386c98e---49274917172.pdfIn PDF document text
    • http://getvisa.ru/images/File/miwudedadizabekujetup.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b425ea62893---totesugoranu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9e8e89e8db40b0596427edf0e4c798bb/28865126139.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/dabubus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fda713eb757---romujik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=path+goal+theory+leadership+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_off0000c795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 16104 bytes
SHA-256: 29dc440d8280b43e8f05bc2eddd14f56d92121f962aceba05b1ce09c54a7835f
font_02_sfnt_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 10788 bytes
SHA-256: fe0a3422d7d26fb5d8210494911ab8ff7dfd3c2be05a1d1ba12882b6bf2438d8

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