Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8adb8ee56a4a25…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 20:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f4b15220141dc62249382df8e4a3274d SHA-1: 7eb7708aa8645bdf126b437ad89ac4f3de5f844c SHA-256: ab8adb8ee56a4a25c4b1f97d459d77e65dc73c95ae0f9a57309a2b1b268913be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, 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 used for phishing or malware distribution. The PDF structure and embedded URLs are consistent with spearphishing attachments designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=transfusion+sanguinea+definicion+pdf PDF link annotation
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/mavezovoxanegukisogusibi.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/72934690839.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/55996041740.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/54474808885.pdfIn PDF document text
    • http://hotechike.com/files/files/wenomunaxesoro.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/732c0ad6e2a1da61af199679065317d6/73523660928.pdfIn PDF document text
    • https://angkalaris.com/contents//files/82962789512.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/fapulopexalidowalajise.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d33fbdb54b63a50ce1d710bd75b66ed3/6541909862.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/46248415892.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/70kmm66cn8nk6af8j0ovtq9fc0/wujuw.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/sebiludefavamumalomijati.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/jiburisudexuso.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210525224746.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/254354901.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098998beef45---4531954711.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f8f3e924---44077741926.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/zisabeben.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/talatev.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6525a5375---bunokarurumagaguwomo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9e6fa122a---59028719056.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa27f20150d---dovinefitobobetepegaveram.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/994344601.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/90072229972.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/32976715061.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_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 10716 bytes
SHA-256: 1a1bc48107c0914350b1c9c85206f95f50fff94c68d5a5d17baa4e93a3d9d487
font_01_sfnt_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 18720 bytes
SHA-256: a3ce37013f03af9004ec5fd73bde15dceb9112b0c474b9dfe955194c9bf06992