Malicious PDF — malware analysis report

Static analysis result for SHA-256 021198bd64565497…

MALICIOUS

PDF

79.0 KB Created: 2021-08-20 06:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd38c58aa3699892ef247447b9b4721c SHA-1: 352ee5a2ed54d5411fc54ba64f5c2579b941d8ea SHA-256: 021198bd6456549793c4c4f2b393354ad62b3698f0b5938b21bcc2911e20b643
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the document is designed to trick users into visiting malicious links, likely to download further malware or be redirected to phishing sites. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://propactionvehiclesuk.tv/userfiles/files/62783213859.pdf In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11dc2aef39---pagamukejake.pdfIn PDF document text
    • http://4bx.pl/public/file/namumojadorid.pdfIn PDF document text
    • https://triosms.com/userfiles/file/bexapajurubemitaditebu.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/gaparafugabem.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098bcc44a846---36482504127.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/mefopepak.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/54018159432.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/xuvifulasugimesewukik.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/51460186412.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/betajagulexodugegiza.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608195fe75367---27077020144.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/89138521153.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/k741vl22g1lsc291ovgnacufl4/zokinebuladekupigi.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/52400137505.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/8f74e722332c3d13dc569c5f1ae4ffa0/figudowe.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/lewuvafivisufunewokojufi.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082a7f739803---dapige.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0c24bc96b---16306327408.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8887505bff---selunapopo.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/xowelege.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/pegixazupodevedabekuzo.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/51402384819.pdfIn PDF document text
    • http://benrassam.com/uploads/files/93341353189.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/vodasusunojoriva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ppi+are+5+review+manual+pdfPDF 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_off0000d0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 10660 bytes
SHA-256: 5f7c94e2b1d54cdf4b8789c219002f7b1c073df7777f792a6016b030b31a53b6
font_02_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 16824 bytes
SHA-256: 51ae9d24a20511bb07fccc65b2394dac2b13aaf09dabe2bf82a64f108747cf8f

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