Malicious PDF — malware analysis report

Static analysis result for SHA-256 98261402834f67ec…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 21:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c82c270a3e2dfaad3b91150680dedb8 SHA-1: 92266ff006a9b6a7a61ba2a3b70988251afe6b12 SHA-256: 98261402834f67ec024e7282ebad581bfeb65a77fcb90e840e5b9c1f9b75b65e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=math+9+module+7+pdf PDF link annotation
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/cb8c4bf6c2108c783ff574284cf7a329/denoxaxasamezaz.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/4900890007.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18699717a---xowajemutad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607054d3bbcc8---33918447693.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/89808918346.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/66514134935.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/zewelitumututaxajen.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/pisilixebevujizi.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b07db72e8abdd64bf1651969cb8a74e2/43549199063.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/90516715088.pdfIn PDF document text
    • http://tion.hu/upload/file/kegibumobinelo.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/kotuvibotuduk.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5ebf37eb06b9dbfa68c8e4cd328723e5/mimekuko.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/retedoximapuwale.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/xerifokokikenur.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b0e5f9c6420a5e4e3feafded55ea34ee/sitonanikaberobemoxirel.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cf93e578889f75bed1a300fceee1076b/jirekamuvuvonuwalikuzonow.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/51354880373.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/hp7pkgkmrc61npr1k0u13p28nh/54133646424.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/51627902250.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db337a85038abe7aeeecf014edc9bf65/kexiroguxagapikigomiw.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/mewetef.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/giwimiki.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_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 10612 bytes
SHA-256: 07bebde2ca1eeff3e1990e5e5387d4007f0a28cff0cde8e775bf31105c3a5879
font_01_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 17696 bytes
SHA-256: 6ff6b5fc77986c94026579a1212850b4dca2543cd211277297d880009e9cbebc
font_02_sfnt_off00011e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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