Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bbf3b99216a2a1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 23:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b104ba0d7a396cc426956c79a2f849d7 SHA-1: 49bfc7d394fda21316dc4297a59312eb8cb69390 SHA-256: d2bbf3b99216a2a13506334a2a8f01e7a91317a85738f7b6a5a5ac297c800d07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL distribution suggest the PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wonderful-foods.net/userfiles/file/gipokigirijox.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a1342fd24373384ba374098dc87a426a/4295801092.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/23956770521.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/56026292023.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/701f70e5e7c743c99dc96dbb53096781/buvekogusulisavutaxawif.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/6f55bcc013e6194d4c3e173797140b3e/jamemenazul.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/zamofudupevezimuxosekugos.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/86790507526.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/vanovufuwegatukiza.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/nojowetowidebokuxi.pdfIn PDF document text
    • http://dobermanncz.eu/files/31555901537.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/84025048467.pdfIn PDF document text
    • http://patroha.hu/file/90374598501.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/28497849861.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/36055802273.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/jofuwowafevovefegesirupa.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/sivukov.pdfIn PDF document text
    • http://rilta.net/userfiles/files/60689378079.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/tales.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/lonasigebefiva.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/dasisatatemowe.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f5f65854f---sigixuzakegana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fts+19+mod+apkPDF 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_off0000d76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 10368 bytes
SHA-256: f96c1d5fd485f1017c81a7fe1c95c1bbeb8b12d910543bda77ed692bff846bc5
font_01_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 20480 bytes
SHA-256: a74d7bd2fda77e2185b72310d8dfd0c5f0f8f77e799a02f3822e1bca3bc3ef4b