Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f7fa7d4aacd6aa…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 20:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 827b41f996492196716d20af64cb63ab SHA-1: 6f5be8ea485a9b35083bd82b6a993413fa5449c3 SHA-256: 79f7fa7d4aacd6aa0227f15855a574ef83fed698afa94a415d5fbf7cde5b2172
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://nomylo.ru/uplcv?utm_term=paint+file+convert+to+pdf PDF link annotation
    • http://hagelkonzept.de/userfiles/file/tukorexapedug.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/vemugonigesogagaxagebid.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210909072359.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/bajozovalavufeja.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/kusoluvenife.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/wekeveberujide.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/89975658340.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/33746095749.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/26086675985.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f1d9e47fdca7f99623c8112f567aa7b8/fujovofusa.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/wodunuvirujufiluradi.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/88171461813.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/18753447903.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161314413051f9---97642019360.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/18472869561.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/49262995600.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/20025973055.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613625ca1e711---13477333488.pdfIn PDF document text
    • http://herve-coiffure.ci/files/zelojijetakakekuga.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/72814490835.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/61436003693.pdfIn PDF document text
    • http://a899.net/userfiles/file/98266668296.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/46125247273.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/29840744257.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/5443924650.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/wovaxulijekegiwuveg.pdfIn PDF document text
    • 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_off0000e568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 18128 bytes
SHA-256: 2f7a89faeb4d0630318699660fa15ea24e79ec8f93fb7e960106a0aedbbd4786
font_01_sfnt_off00011472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11472 10512 bytes
SHA-256: bf4e70602f355ed26fdef962b36b0d259d380199266ed63b545c96e6f91ec05b
font_02_sfnt_off00012c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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