Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbf5a23eb2e4430…

MALICIOUS

PDF

98.0 KB Created: 2021-09-07 14:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 81fc678d53f3db9cf1faca2102d99af6 SHA-1: dba55edd84d713c08246b519100c526920884735 SHA-256: 6dbf5a23eb2e4430595a4363a12ad01134b16ef2c0b39fc6267d4266fbd19570
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed for SEO manipulation and user redirection. The presence of external URI links and a link farm heuristic strongly supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://scvumaichiramen.com/uploads/files/2242506426.pdf In PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/9753039980.pdfIn PDF document text
    • http://nature-revive.org/files/file/gaworo.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/39864608412.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/wubigomuxomixinibakudeja.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/runijawamepazoz.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55e30dff30---nidigakebewed.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210806112946.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/pitesejedesa.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/kavesiruraganozapabufepus.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac56d24ec76---buvovogeselutitobamibo.pdfIn PDF document text
    • http://stattus.com/assets/file/18534334562.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d632c479ec---tiwasibijevafapafevosut.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/92650442350.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/61784983408.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3cff0db1---17886794414.pdfIn PDF document text
    • http://fitviewer.de/files/file/jibex.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a48f8d7d1d888d5e141510c9d56e119d/26518409441.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/62154339711.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/wazodoxetuzaridojigo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611948323c22d---27663984552.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/d9216bbb5bfd6ecbf02c7f5d5b71e48e/16887223841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=greenhouse+effect+in+english+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_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 18756 bytes
SHA-256: 7c602a4a4031ba45e37f05e71e960ea79dafe49c9c898a8ea91bea19e07a9e42
font_01_sfnt_off00014a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A08 10876 bytes
SHA-256: e2c710224bc942441c064fe5afcacfe612f60a2b1f7664f206c442c76839f491
font_02_sfnt_off000162e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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