Malicious PDF — malware analysis report

Static analysis result for SHA-256 0caa1e2dccc61c04…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 21:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1a5fe668e2c67dbd6af301fe42a6d275 SHA-1: ac8ceb79794ac4ffd3a6a24df09d80fab62de8ab SHA-256: 0caa1e2dccc61c04b10f17511794b8c46c2819992bd8267729237db9c657c8ba
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the heuristic findings suggest the document is intended to redirect users to potentially harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jelivanurojovekomubevoz.pdf In PDF document text
    • http://onroerendgoedindex.nl/images/uploads/60514622660.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ac18e5472cc262f1b21c9c3de60c1404/49254006265.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae6ad4b3c---48887638136.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/84b68a3205ab1ed8376dd596f98650c4/32622124219.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/86c84be1678d9662211fa3840077f99d/meniv.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/jogorojiw.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/pekamepuronidusujamanewu.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16209509861097.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/681011eca61d716f663e954d36674c9e/48497685325.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607172e7f262a---ruzijekuwasugerowuxugug.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609477d60c1f6---zujos.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/31690792483.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/25975190022.pdfIn PDF document text
    • https://songhong.info/userfiles/file/12468485078.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/715b73d8af84de606d612bb372f5f9fe/94023366313.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/44638073394.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/vifonidurev.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8138e172e2f11d0ef71897dc1fd6b9d8/podenarilejajosejibulef.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/fepog.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bba5185378ec7d611ea9e85e71ac6d8e/74445248731.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f7951090---dizafoxoxilibefajox.pdfIn PDF document text
    • http://k1a.ru/images/files/file/wukosogonazeraf.pdfIn PDF document text
    • http://llux.vn/uploads/files/dibiramarosugijaxajunap.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6cb31102---supamenaposoputozapir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=approaches+and+methods+in+language+teaching+pdf+by+richardsPDF 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_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 11404 bytes
SHA-256: aca05f89b4afdb3a885822ac32455c99a5c99e868583a25568abc8387ef692fa
font_02_sfnt_off00011e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E08 17332 bytes
SHA-256: 825db14897b9ecdfa85f5b8b6746e8ce3c7b167306b571695c389286cec8774a