Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bee04b628fe25c0…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 05:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16e34d398093ccff1bde986c23158f1f SHA-1: 7447bd0cd2d38de21918a1b97a2a346a30a5c70e SHA-256: 7bee04b628fe25c0a91cd87fa8aeadb42fe7176e0a8c8bb964dc0c209fb7d362
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.dogwoodagility.nl/ckfinder/userfiles/files/35647265728.pdf In PDF document text
    • http://vendsol.com/userfiles/file/72381109980.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/kereded.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/bivosilobubeladibutovozaw.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/lodopodenafunezepewe.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bec5f4aa0f06f85f5e414dd3663d15ab/jirupuwidaxoge.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/sakobunoxufidek.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/47083645447.pdfIn PDF document text
    • http://qwerty.pl/_data/file/durok.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/41363957669.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0376a8f1---luvulaxirezewogisom.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/pevutixegelap.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/39007821651.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/kekajositaku.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/69675994491.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210906164513.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e82d2e7d86---sovonogenozaguveken.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/52863623014.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/tolopiposin.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/zemipudufu.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/zebizedunuduju.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/wubokoxokos.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/30436418664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=apk+free+fire+2021+no+obbPDF 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_off0000b24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24E 10384 bytes
SHA-256: 287bdccd583ea8c4176da6bd0baa46c35b34c5f86178740305bf91d7f9b03f68
font_01_sfnt_off0000c9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 17628 bytes
SHA-256: 438bce4699aec146b9bd0318eae124bef77efbd94dfe753a636e111d45a69a62