Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43dca4264d111ba…

MALICIOUS

PDF

101.7 KB Created: 2021-08-11 00:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba55f2d0dc4b6b505198690a1160b4c2 SHA-1: ea8c0cab603e8a029705ae0a855ae93ee950bff3 SHA-256: b43dca4264d111ba1e622f98a3bcfa691b9ac28859b7f738d1646b76d1d2bdfb
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to distribute phishing content or further malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/tca6nb6flse8gsq7qmtcproqvp/43966555098.pdf In PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/luvozuduwelazaxizuke.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ea122eba7---78735754136.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/15478910022.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16083d120761de---vorigotifisunisenararut.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f4b9778635f0a7ba6c00ee294bbf2927/23793407919.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/xumewiloxixuvobip.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/85363897504.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/61415023780.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/dovodosofupodo.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775ebbf1dbb---tanoridunegozi.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/84886594960.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ac566f79abb---89267521049.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/bssr9ck1ol0h4a4csgi9j4q2pv/gagalewuwulojaganelu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161080ca12cc02---27299150082.pdfIn PDF document text
    • https://songhong.info/userfiles/file/susibiwivugezazige.pdfIn PDF document text
    • http://bougerpourstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/dobazapolejudubixuri.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/85495587552.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/muwenabunewapopi.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210804040121.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/jaribifis.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/75131263085.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb55f7b36a---terazirusotudavipeturuga.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3294d433e---karimujolisiniralagegalar.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609403b78fdf9---zajirofimosumel.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55cb231b3---virufotitux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=livro+de+biologia+1+ano+ensino+medioPDF 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_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEB 21412 bytes
SHA-256: 353888f5ece2af97ad0534b32332d43b6f0cd7707e35890dc5850b3f21a74a02
font_02_sfnt_off00016d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D96 10708 bytes
SHA-256: a1a6f903088b980e3e0e9c019b6c9d59f1bebbfb59c995535b2d104132a9c57c

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