Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30d447b85462f43…

MALICIOUS

PDF

89.6 KB Created: 2021-07-14 03:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b5d28290caac5681d68048173bf5ad41 SHA-1: d0664bdcf9bcada195a66efddcabf2d78d8d7bcf SHA-256: f30d447b85462f43b7d5042e9f409641b8f575f89fa38f47b75469d58dfcc254
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. This technique is commonly used to distribute phishing content or redirect users to sites hosting malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=history+of+japan PDF link annotation
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/npfliqingabfu8eq33kot4442h/3436582163.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062916320027.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/jidalefebimulixufi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe24fe5af8---69937270180.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/73940180049.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b622fe5d---71253285081.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc49924d55---powavurusev.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626efa4616---42494971185.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/pixilovomazukad.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b55a689eb69---bazisopapupo.pdfIn PDF document text
    • https://tepihtrava.rs//files/18299818485.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/xigijowif.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b4f9e357---64285239695.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/44733134314.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/hmcm3jja0jnht1ng4mf736mtq1/51635351846.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/tojawuzanasefi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160984f6ed37de---3860624881.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/sodowapuniwavewosafomu.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kobilusarux.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda2adab69a---73211195237.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b1497b1152ce0467800f8c51f4d65d77/78371478682.pdfIn PDF document text
    • http://mfahk.com/upload/files/54265567792.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a70ad59d7---59476492368.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/xojigaponibinoz.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3ef7f4bf351cd691387b9eb74f2c80cb/vumetalalizozabojufa.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_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 10408 bytes
SHA-256: 8177a00702d16339dbb62017fc44e3bdca437a1302a469efaa6b833d3d4f4a73
font_02_sfnt_off00012aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEB 17288 bytes
SHA-256: 112cfb0c0de9759b23919bab36e5a1e696730e039f0a4b9046d650bbce0ed366

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