Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9f28c5b6e7c5d4…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 09:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 580380767fc4a7f30ba35eb06291c9d4 SHA-1: 439e05636766a7cc326d47a0ec7745ed9d4a53a4 SHA-256: 5b9f28c5b6e7c5d4c148dbaea9c0f80823fd7e303951e39baaef7a4490fcbc26
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, including compromised WordPress upload directories. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://infrive.ru/uplcv?utm_term=tokyo+ghoul+live+action+online PDF link annotation
    • https://kisikana.hr/userfiles/file/84807395790.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/15664824472.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089523da8550---futojaxid.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7552e257a---janaritijo.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/depaxudaripap.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f93eca1360---84782031689.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/xuvakobiguvexebijid.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9b0a5db3b06959e8b1d5eceecbe5fcba/46620071263.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608adfcfbf629---25710875459.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/29d23ba5b0f0dde69cafdd06066706e0/lotopixerofam.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/fr63lsku08io7100r1ldchfvsb/22390017627.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42aece4345---wawaxomuxugomifigakivutef.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/53076414776.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ag7nqjh5k8sbollhj106ah0pgo/tanetediwemuropu.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///jepelagobusawevaloxega.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929ab558f12---befujupekoxozogisoru.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c4361ac5a---jexowazutifu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160beb2d206870---41564878315.pdfIn PDF document text
    • https://samowar.ch/upload/file/neremilexatepirolesunafi.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/nesodewenebop.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160721ee6763a9---4225227274.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9d2987e53---56283030768.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 18812 bytes
SHA-256: da27cb1dfde43bc4ee54b1679937c04844e603962fb465d9368b3191b6b78fe3
font_02_sfnt_off00012afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFC 10576 bytes
SHA-256: 121adf490f831695e98bacb812493e94619489f035d556c27bc5edbee801b5cf
font_03_sfnt_off0001431e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431E 2976 bytes
SHA-256: eae96e6fb40ceaac6a0c4deccf4225b054fab8ab8edee4f0246c69afa445a167

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