Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3a980cdb42414c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 18:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3be4ec0e9183c7dd80f9ee2146bcecde SHA-1: ad12b01bf3f962ba65788a3cdea184adacc7a0a6 SHA-256: cc3a980cdb42414cc4dc04a0276f8c8c7dfca4f012d8bf9a2ffaa87a9418d8e2
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness. The presence of external URIs and links to compromised CMS uploads points towards an attempt to lure users to malicious or manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://krisoc.ru/uplcv?utm_term=the+queen%27s+corgi+full+movie+online PDF link annotation
    • https://swagath.co/new/ckfinder/userfiles/files/87133282817.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/7051798965.pdfIn PDF document text
    • http://dalaichau.com/files/33660928958.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64935272408.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/52841330482.pdfIn PDF document text
    • https://tierlistei.ch/downloads/jagaxaxo.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef5d3c7602---529741985.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/guvupopazumexaru.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xeperafokufaxujodelotu.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/21924082342.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/90249993057.pdfIn PDF document text
    • http://htwy.com/upload/file/towejeliwosikimakifebe.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/rasirijufudimifivude.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/buwuxesutazojotixejumov.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/83696bc359a3a10a1b87dcab39edcbff/53943672742.pdfIn PDF document text
    • http://aquatherm-graz.at/files/63502854223.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/59898398555.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/6213763434.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/10504853361.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/72260758312.pdfIn PDF document text
    • http://newcityhk.com/userfiles/vuwikedolo.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/66038e09cb822b194b0e90d9df9e5994/vuvojalodusoxizu.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/gaxezitolufo.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_off0000c977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC977 18236 bytes
SHA-256: fb02376cf13cd69475672218ea1437c4fa5b179d9bab2116b7a293a9173f3344
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 10832 bytes
SHA-256: cf80110748c7e9d24a175e87cd8683ab02a85da78f6d8fd89a5fbdc577dc4ac8
font_02_sfnt_off00011173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1