Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0338cb7b01e7542…

MALICIOUS

PDF

92.3 KB Created: 2021-07-24 08:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 31a731a10cdc782de12b63c60b27c711 SHA-1: 678a1c495f511aa2aaccfc335702d64d5a46ed3e SHA-256: b0338cb7b01e7542d5f3304f327d6d69edb8c11231e9a36ff1345d7494461c8b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the presence of these links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f762f507c47---91483729703.pdf In PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/bemadekoxasagego.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/835d357bdd46e28fb7c0d45e24fe82ee/55873434471.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70f03affe2---xerisusomugoganerajuriwi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094858489aec---78511529230.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2bcbec539290f108d7266e74811fe618/wowavorajipulumifi.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-28/20210628163035501931.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/31562344198.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/ebe57ecace889175d06a187e33d0fed3/70905942580.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c2dd323d2---sonidimebiditiv.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/zubazol.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/58124920500.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91685654028.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4bd8a6db0---figupawimenomu.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b89abdaa4---josuledew.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e67c8870---tisupudetumijosa.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/73287343089.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/xujokedixebopagupivoda.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/54458725067.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16096bab52cb35---fekizefitidik.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0ff579e2318e6a421d724b4e7724dfcf/fepofasavaxebovupujuvak.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075893f7a924---dupitetimonamosixisa.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e32502785e54de8741e3e6f6c2fb5b8/36813102526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=acento+prosodico+y+ortografico+ejercicios+para+imprimirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 18696 bytes
SHA-256: a12dfe66b15520edbe606da2b9976c8391f2b3c951829c196b85f37b03250d6d
font_01_sfnt_off000118bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 11140 bytes
SHA-256: 0ff059d051d278e00cf5be85d0ecba1b3909e00ef860c686ebc1e03dc700a96d
font_02_sfnt_off0001329b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAC 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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