Malicious PDF — malware analysis report

Static analysis result for SHA-256 9354e7ba2a065709…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 16:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51557c4faa0d44579946c5ec0c7b5e04 SHA-1: 48aca550dd7e949072d066d6214213e6609d29b4 SHA-256: 9354e7ba2a065709391caea666cd3188d5eb2306d74bbf66f0ff6ea6a755d716
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of external URI indicators and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=features+of+distributed+operating+system+pdf PDF link annotation
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b378cdb9c52---11438185777.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/rekanotajawadatosowo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/vk67ffbllaa7q8glkdtcm7fep1/mumupogumuzosi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4a04b46aa---69648520324.pdfIn PDF document text
    • http://endemic-capital.com/uploads/files/37022226925.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/nudolorunanabigupi.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210819_115434.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca3df08cab---80638565354.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/fogulizewu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/p9nucp1omlgb1m8jo7t0qrkj64/zisosagezevemowodafumi.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/lejadewe.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/90346363255.pdfIn PDF document text
    • http://belean.pl/userfiles/file/rurapovegonazogebufu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ce311d13---81677158829.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/vujipevopirenigukabawujul.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f283a6e8bd6ee74e02734805e0947a68/19236247110.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5d3b807a9---83388100306.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16097f7e0a5491---82875946947.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/44026535760.pdfIn PDF document text
    • https://ancoraeducacion.com/images/22148198777.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607095a03ba03---pisijunadejawokodu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608be367800fc---konekefelofufazin.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/dozomuzipokubabupetemi.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/nifukimabok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A6 11124 bytes
SHA-256: ef8835e722293856b23f48b06a5fae451b5acef0033e9fa4d9be44ef7cff9356
font_01_sfnt_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 15280 bytes
SHA-256: c6ea3577109a34cfb820f420b79f9b622404dcfcdd9fbda336f8707ae6efb28f
font_02_sfnt_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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