Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b73db855ae060aa…

MALICIOUS

PDF

86.4 KB Created: 2021-07-18 22:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19826e53a8bddda25f1d5edf1e445c56 SHA-1: fad9b7fb312e246ae9ba675b68d04b2cfc17a9e2 SHA-256: 9b73db855ae060aa1c1e211076689c830f5e4fd46883a2ca63366f70ea484e14
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's part of a larger campaign to distribute malware or phishing lures. No scripts were extracted, but the presence of numerous external links on compromised infrastructure is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b831409681---sumefinusirixenanogawige.pdf In PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e69aab68a---lukakurajigelofu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/313547727471320c53cd85d0ed083e34/21604681698.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ba758cfcee4759054bc7c4deaa1c2d03/41980876420.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cc164caab278e2a025ca0e73c04faac2/85993367735.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/47bdb755876f6e121583653f4dfffd59/xavanigaguripubesego.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/91565508506.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/k9ih994278lcgggt33sl1vai1q/45252319792.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/zatazigumadovixez.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bff316a058---xobaze.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/96792651795.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842f9ec7961---87460112544.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a96664fa---88616005940.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074186d9ccc0---pebetatopugijipi.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/kokin.pdfIn PDF document text
    • http://agama-rc.com/upload/files/67670668156.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/23544795482.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fbd58bbb1---xeredovif.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/5594392179.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/nonadafezitopubilirox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=demarcated+meaning+in+malayalamPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 10540 bytes
SHA-256: a256060893346615db6eba668cee7e6578d8c0f38c531bf7d8f87ecfdd7aae21
font_01_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 16524 bytes
SHA-256: 3cdf4f8f4dce7a464fe4e8ceb6988aa5bf7bbea20165803f235b519784394ddd
font_02_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 17896 bytes
SHA-256: eae6230f933211aee3ad76d4d30798d0cc7b3a40182ed07fe4785bd79e491d0e

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