Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba5de939c5adbee…

MALICIOUS

PDF

86.5 KB Created: 2021-07-03 20:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e7a66e06d429bfdeb5beda4d0166fe32 SHA-1: cbbbb607bb32d651652470f4a40301e1e49bc9b4 SHA-256: 5ba5de939c5adbee0bece2bb793e9f866a30ef91bac4e44e9de0bd04d0d53b4b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://travelshops.pl/userfiles/file/xufola.pdf In PDF document text
    • http://ladyqueen.it/userfiles/files/zozejalozefotituganovenin.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3f3cad9203ccf5a0efdb3e9fc5d58bb0/7444659675.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/defdcb084ce2e3d109ed25375880f9aa/rilulotubibelofimomakim.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/negabagopapabakekajoxezan.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210620025812.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160768f1334af2---46837689835.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/12209408466.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/laefbr8mui76hq173g8uvta7df/40418309467.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/dosimelegefiduka.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805ae5bd665---15926698486.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed9c541ed3---jemijivinewujurobe.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/83463004905.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608237d3bd9c8---bedukofalulineruwi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e8ae7ff1---91251863508.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708daa27013---2219996668.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/193d9d03bed6d00c64f6c6bff3f5e600/3876502934.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca8b27969---lidivufopibuzereto.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d1b11adecc3aef18d98c294ddd4a38ed/90023256570.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/3da4bf6cf454f38ef3ee7100b3b5d9ef/79018038789.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/34476638813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=double+bollinger+band+strategy+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_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 17524 bytes
SHA-256: 4371c903b820afdea1d25017705b14ce34beb43d3ead163fbd6ddd55773a36d1
font_01_sfnt_off00011b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 11028 bytes
SHA-256: bf5be35a621e99bb82d072dc27f3f948745012feabb258bec4256e74ab8501d9
font_02_sfnt_off00013483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1