Malicious PDF — malware analysis report

Static analysis result for SHA-256 331cdac1105c26f5…

MALICIOUS

PDF

124.6 KB Created: 2021-06-25 17:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d46b78f45ddeef75ab79b0a1cab8b25e SHA-1: 7a7c5d27b01197151b612dfbe53898481d2acfd7 SHA-256: 331cdac1105c26f51245db68719f965cd6d75637d50f26ffb746094800f8d412
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the primary attack pattern appears to be directing users to potentially malicious or SEO-manipulated content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930e0a38296---pibavozozototedotan.pdf In PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/foxatidik.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/58e06607f1f1066252822fce0c4a54d4/44804707201.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad68e6ea988---rulezixojewigewuviporoxi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6abdc73a8---97341216889.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc969ad700---45355139879.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/pelosonu.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/28c8c6f2fe3c98624fdee1821f75ea8d/wigufalitefepixi.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/vuvilaforuko.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/35aa6c1f9ad2f5647ef030bbaea26694/wipivikomixu.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/3b1pa9ui2753utgg4ihn6esu01/ruzuzinediwivukubukez.pdfIn PDF document text
    • http://rsst77.ru/upload/files/sibegewepudadatoj.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2559908faf99cdbd7b7ca1593f2506d1/mefudejefi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c650937877b---92395991123.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa894e1ab9---22759079042.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/guzijutezaf.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16097693992d45---gipimegepeguxujapi.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077b90db3f54---95681885066.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/kl4cba2e7mt6o7ukbtqb2hdsql/94687929374.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/robazofokub.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/20861604513.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087d61bd921f---fexim.pdfIn PDF document text
    • http://dzbnf.com/upload/file///65992373574.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/025e722f4577fc3c8cb6677a34a48405/96073511871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=calculating+wavelength+from+energyPDF 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_off0001571b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1571B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F2D 24160 bytes
SHA-256: aa2facc7e960f7987650296b490d143eae66f3a224e83cec54961fd47e9321d8
font_02_sfnt_off0001b1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1BE 11012 bytes
SHA-256: eb8b10bc8ca0a83f3b6b00cfceccf5999aae19ebad704dec7fb2ab930b586d4f
font_03_sfnt_off0001cb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB3A 16736 bytes
SHA-256: 2b596e5d390707a81b384f59a191f260e4be25e7c50c1653a72c273c5827bdbb

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