Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4406c2b939e266…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 06:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e8e52ac9a0748d9e904eea4c14dbd6b SHA-1: da7e6965e9c15e19b8ba3a1f382b6d769fbf5c16 SHA-256: cc4406c2b939e2660aded0218ecce578bde6e2f2a1249d9d5204f0bc4fe18fba
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92f4f01a1---sijitogunamiwulubiluwodi.pdf In PDF document text
    • http://dharmapremipariwar.org/userfiles/file/fenajenetonomawen.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16094400310d32---wenurawewekevep.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/93970324468.pdfIn PDF document text
    • https://baongochoa.com/upload/file/getikujenijofesafaxom.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/55362834671.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/da9dd6ce874a04e00b1731d3a9865920/kulasi.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/duxaniku.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2eb014ab6---63447982236.pdfIn PDF document text
    • https://medicula.pl/web/uploads/files/xemasuxiloz.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608795507205a---roxegop.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/60844010841.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/jisatikapigizumipaf.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/240708554.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/23703422473.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/dhqvgm6g9q6qhel6l45olms1o0/29735143708.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa97e8c62a---35199639083.pdfIn PDF document text
    • http://usagimatur.com/files/others/71365813050.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/70956234482.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/kekuvulisofiwizo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/664bf1838b9215e8e1c1515f7831fe1d/51589997357.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/13628880458.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/72397733892.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5254795da---fukinizisituraxaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=strength+and+weakness+answers+for+interviewsPDF 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_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 17428 bytes
SHA-256: 9abbb78073ff6a80bae6bccd7a3ddf632cacf1b18549bdfe3da837f63ab9497e
font_02_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 10908 bytes
SHA-256: f7c24f9c9b9338d3cd1e9cd041a45db1e12d79dcca9e30eb7b5507b3ab0a6a92

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