Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10f19ec4523817d…

MALICIOUS

PDF

90.2 KB Created: 2021-09-07 09:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a965f7b50455021552a4ffba27e43aa1 SHA-1: f04025113c20c835121622c664b4e81ab1ce72f7 SHA-256: b10f19ec4523817d0108c2e8471f71d7e40b95a749cbfe8303d3838b411f1323
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farm characteristics points towards a phishing or redirection attack.

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 http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c39eba82cfb---48468620883.pdf In PDF document text
    • http://bigcool.net/webroot/img/files/jutapok.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0dbbd431f---vovofijejixuliku.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/3412246175.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/58720559848.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/silamodazenusimowa.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/teninakiwofakozemut.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/98e30885b5081ce70aabf1218b93cce2/89155726112.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/riginajonepixamepakegur.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/52043213284.pdfIn PDF document text
    • http://zeci.nl/im/image/72331917785.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/96311743919.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/12d251b2537a91a79c948679e8b79ae3/javaguduvajikiraferatimo.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/71911352034.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160743e3e30667---72722908041.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e5bb74cc52aab495dcfb5147b10a4340/67584733820.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b0d7e93a3---83682583139.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/13040945998.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/24278704364.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c4138cbb94652c46bda75f7ee588cac2/92011726953.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c878720c1c---47843634792.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29a4347e8---36767833301.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3c8a129c857cf049c07041bea436ff76/lenopedixozopuxisu.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/81001467000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=online+railway+reservation+system+project+pdfPDF 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_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 11200 bytes
SHA-256: c9b0943c292ee5dbe785cf7905f577498e4a07d0c10f900e94c95a6a09134bd5
font_01_sfnt_off0001142a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142A 17940 bytes
SHA-256: 18d247d00cde4fe643310cf0581946a105f9aec1e3e5d3e801efada592f589cc
font_02_sfnt_off000142aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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