Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ae5d02c261e7f7…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 14:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e795c46cb174dfc2fd72213bd0a5a8e9 SHA-1: ea72582d73874f8a57574b9caade860314c5b1d2 SHA-256: 82ae5d02c261e7f7c4c1b0759b392662d7b5db273ee30f259795f3da1caf594e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/vafaxarot.pdf In PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/pizagaluwazipopuxuvagaf.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856eb329f6c---1301935575.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/fotamimelijibegad.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/57780393877.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f553c271e4---zifuvubinegixefijabiwej.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/kabenipogorepaduzufewujax.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/61637351286.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/tesurosibe.pdfIn PDF document text
    • http://emeat.ru/var/files/65780037095.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/a17b38d01e6a8bed148e75afd5feb0ff/18109750211.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/94468960956.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/sapepufu.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/ligudusidosaradi.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/rifiraxiwulaf.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/pufadogumijofokidivuriso.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/78551286580.pdfIn PDF document text
    • http://imaginove.eu/data/Files/lotavupaxekugadawon.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae16d13435---taminoredavosigo.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/zumaxi.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/6c8d5ac3b94e80436d25be1f10954a55/1107739128.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c38f2a218dd---gojojupemer.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/josojebogarekojibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=building+vocabulary+skills+pdf+downloadPDF 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_off0000c719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 18968 bytes
SHA-256: 8fea0f63c787c983e2b795a40d34beb35422b544199ae202fe34f7892dce5244
font_02_sfnt_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 11216 bytes
SHA-256: 149716313c790acd6a929be0561ca4aaf340c879fe399d17c6ddfefd5916e4c4

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