Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f98f4cd17b61130…

MALICIOUS

PDF

87.8 KB Created: 2021-09-10 19:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25e6406d5e3c01f4d689c3d072cf2f1c SHA-1: cbcb4c3ed2e05020941b114c93df24cba3bf75ad SHA-256: 7f98f4cd17b611307008d0e1c73f4eebfee08fd8824b8e121c2ff66264a89fbb
164 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for SEO poisoning. The presence of a 'download' button lure further supports a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ancheng-medical.com/uploadfile/files/vogegixidakiruxuxubiv.pdf In PDF document text
    • http://hycxchina.com/filespath/files/20210908191547.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/58783354736.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/tftb8ieps9tue13l1hkkp9gp65/85188349768.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335dc5965c7---tokakubudepul.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/duwefidedifafofube.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1f1etkqi91jvvmoog2ha4t1hdp/88266693053.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/nanegorumumusepuvuki.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lvd7l1r63g2bbuh1fdqo7vbttv/57354209465.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/fuxajiludugawulis.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/xudakigalibe.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/mafilaluxojuximetebaz.pdfIn PDF document text
    • http://only-svet.ru/upload/files/mudiragegudejabulumino.pdfIn PDF document text
    • http://scsychem.com/upload/files/fuvixakorivure.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/xijagumupuwuzewuditob.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/12985126179.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/17779512336.pdfIn PDF document text
    • http://kco.su/userfiles/file/56672916946.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/wixul.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109032019426478.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/jigimujo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/t98rhoktmpscmkqf4jutmfrm5u/puduzekiropal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=crack+autocad+2018PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 10544 bytes
SHA-256: f7fbea5e05375173f6247dd0f5e3a41df6bd04b08102dd6079dd1ab2e580e529
font_02_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_03_sfnt_off00011694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 22464 bytes
SHA-256: 3a286a479d523c29f3866735e8a8281e6366525c0d4de4ddaee21cc8d203b190

Open this report in the interactive analyzer, or submit your own file for analysis.