Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6a511ad51271c3…

MALICIOUS

PDF

96.8 KB Created: 2021-09-10 06:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b8abd2921e18612e6a7409811d66f0e1 SHA-1: 8a4c52b5cb920a4ecae59ba0531e709c6001860e SHA-256: ac6a511ad51271c39659d7f1e5bec7b8201fd11095d69edb5adcf0e9ee893996
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sherwoodonionfestival.com/ckfinder/userfiles/files/relekujavuguzimide.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306cca84867---rodezawigafavajefulo.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/37904283484.pdfIn PDF document text
    • http://baoveantam.org/upload/files/82565961967.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/nufepurujoxoguvisi.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/12197012594.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/potev.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/sulosumidifomijud.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/26429297329.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/xuxunokedodevi.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/12401715196.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/97033881255.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/aa0l01obcfk94mtt5g3kk6ohv4/pezonow.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/nenuzal.pdfIn PDF document text
    • http://elsped.hu/files/file/mefubo.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210902215913.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/ligogipulexikemu.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/25229911622.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/wofegimoj.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/63091955419.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/paked.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/givizixogilolebisaturax.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/6f93p3cmu0vemqmo0pv28sjb20/40976645258.pdfIn PDF document text
    • http://rayanchem.com/d/files/lopepuwemu.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/42822551802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=crash+bandicoot+4+it%27s+about+time+pc+download+freePDF 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_off0001138a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 11352 bytes
SHA-256: 8c051271fe1d373078e870dde9b416b52c508c4b8e0a18f6ac7c723c9d8e6164
font_01_sfnt_off00012e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14615 17936 bytes
SHA-256: cb0f61e4c01438527a0fe841d157e480b5f02e9c2e7c0ae645380b3a475a00ce

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