Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd963fa917635fd…

MALICIOUS

PDF

83.5 KB Created: 2021-07-07 17:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5c1cdd44d10f3c735ff7002926861408 SHA-1: 377c074ecbd657805198eac6e6210d4290ce6e1b SHA-256: 9cd963fa917635fd4d93e2936ec674e0dae158c5cef55c3d09052af0c4b6be14
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 contains numerous links to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

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://nomylo.ru/uplcv?utm_term=anencephaly+medical+definition PDF link annotation
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b9a90756---rokovakekafupesituwubof.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b6133012320b75a5733191ef8f84f0ca/68542996765.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8408929575---91878673243.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/79edd7c0eb6888a482685a11f92a696b/vupuri.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/52296174492.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb00d82e10d---zuzaruvo.pdfIn PDF document text
    • http://gptools.net/userfiles/file/12095316513.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/41u3pdau65pmlmb04uil2kos46/46845360616.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/diwoponat.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/22658801848.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bddba00f6---jarebivoxudozodawajugig.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a181ec0d---bowawejojujogetonotew.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7070d1571d---degolijebamuleji.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/50191521789.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f2f45d83f---pufuf.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216291715194909.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/41729900078.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/bobapatuxukekokosanogajix.pdfIn PDF document text
    • http://promador.pl/userfiles/file/88946340272.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/43732239978.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/26133723643.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ebk49t3omaqd1h5egvfm1q9om7/50683756866.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/18996311050.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/384df68609876c45c47a666092950ec9/kimaxowotorulid.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/0b136d2c54a557f395118cd6a9348b2c/10948633596.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/nuponemokarimaxozis.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 18048 bytes
SHA-256: 754073860ee56e0b0b2d73664b70e36a497dae5c908ef7d7b270c20de5ca1c8c
font_02_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 18712 bytes
SHA-256: 64817a20506aba64f17f3e79e2a735876fd3065c860a8060aba4b7abcde0078b
font_03_sfnt_off000125f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F4 10712 bytes
SHA-256: 217d9a159aa7b061091b62736e3f99c3d69dee97adab441ac9626b8b18066793

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