Malicious PDF — malware analysis report

Static analysis result for SHA-256 6467e1ad93771970…

MALICIOUS

PDF

90.4 KB Created: 2021-07-31 20:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe582cf6774be16f6396ce670046597a SHA-1: 44835116c9c012eea497155a5a6807a4c7310889 SHA-256: 6467e1ad9377197012468c549c90426909268511f10ea89d88f9156d43fff8cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve to redirect users to malicious content or phishing sites, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b380fa8f869---38804033565.pdf In PDF document text
    • https://aldwalia.com/userfiles/files/golojulovulimoz.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806d16dd000---21817017952.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/zuvomuzolepikazos.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021517170455251.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d446e4e49f---rukiban.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/74530ccfbeb858f6886e417d2bd495bf/sipodonisubixonitesezire.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/janugejezepodumunox.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/ratomobulixuxadag.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607265a211fc0---sotidipopedenodopapazef.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/guvafeduvuveti.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67d725209d---30739267121.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/rc76vcj58m1mk2ncbuo662rbb3/rokajapasopokanebogok.pdfIn PDF document text
    • http://hak-al.com/resimler/files/2691532674.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6c7a48535---91258343275.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/6713042217.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/97953559985.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/f6de0054a53c84940483f0ba9856458b/fojapa.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fa649c0b83a---88406703914.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/8iv4b9adfus8ds5a2dbv9qfgoq/livedobamav.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/71538540926.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/vuzetelijob.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/83a84c96fe59c2f8aa36ca91bcddd6ed/90794168969.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/selipovu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d24cef1cd71---buvagogofidinaromax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tp-link+tl-wpa4220kit+av600+wifi+powerline+extenderPDF 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_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 11152 bytes
SHA-256: e27b3d5a6089c2ce36f630eef4b454f7ac1db70f2fb3eced13d3dcc52dd53dd6
font_02_sfnt_off00012863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 18140 bytes
SHA-256: ad96bd95800fc46c67bb9227fbaf5b97b012716bc53da7e584c68a6664e6b258