Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cbfeb2e44757ff…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 02:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0573c4673cd10cea0d542b9d2254a4a3 SHA-1: db87714da8bfb186e821c5ca9dca7cf6287762b6 SHA-256: e9cbfeb2e44757ff13ec6db9446c533d23405b45f75c3e0452c3d294bd3bfcdb
116 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and URL patterns suggest the document is designed to drive traffic to these sites, likely for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://usaoxin.com/userfiles/2021-9/file/80142763688.pdf In PDF document text
    • http://vientangluc.com/upload/files/pesepadafobiravemogan.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/babako.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0f0be1fc4---bufewovuxugasofane.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/18220731766.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1ed4fb708c988f74a2b502fec1300129/50359620490.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/mijisu.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/93629580789.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143b5f59f0d2---71144682100.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/79441299359.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/86096378999.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/23146758991.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/24036385035.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/damipunojumasakamibajo.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143ba22964f6---89177823512.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/35749062836.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/purarex.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16142c1c51a40e---85217373989.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/nasipizumelilugudibifako.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/vugowelof.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/98378135063.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/zelugogefijinitegud.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/bivuduzuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=watch+the+misfit+of+demon+king+academy+episode+1PDF 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_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 11172 bytes
SHA-256: 3075aa462f1cde19788fb7c9093f7a0b119c5ae09d935c36327451816d8f3fc2
font_01_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 19396 bytes
SHA-256: 91515f492e77404d8584710286ef30edd3af7603ca8a10b7456a04b7ec9fbdb4

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