Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecada2057890beb3…

MALICIOUS

PDF

88.7 KB Created: 2021-08-06 16:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e756dab2bb50bb4c7848c215e335742 SHA-1: 9146e78fdde07f4dd4d9f2e02963b551488abf5f SHA-256: ecada2057890beb3917fe0fc48ee30a983874305dff43adc26d0693ec3e2bb21
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of link farms designed to redirect users. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc723965492---bolejufujokezinegeponov.pdf In PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/pkiidpa6oqu9astqjb1amjbuno/56243372773.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47e914806---99836380994.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/34370658076.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071432e47a87---89949902487.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/7413416787.pdfIn PDF document text
    • http://marymo.ru/uploads/files/29441145068.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/9971416062.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/88387536052.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/87051443555.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160807fffe335b---nodojevuzumekolekon.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/4748107438.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/jaxisumaganofonar.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/39883078016.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fbad0af2c---kegaxovepitebupusokivo.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b897048bb77---37564969672.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/lirugujogibes.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/54367392721.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/77464206072.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/retuvexudoratabowim.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c8013ac95458a0a473f60489b8a32c01/59076068559.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-13/20210513043008684553.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/68743336736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=inorganic+chemistry+books+for+neetPDF 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_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 17724 bytes
SHA-256: 1f7eb97bb17e76c1e14124abb4213ff3de594c75ae67127e88f4e47c006f3f4b
font_01_sfnt_off0001227f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 11032 bytes
SHA-256: d417a69239bfca353510eab6dc838a2ab0fcf24cb6a9b9404dbf80f73e6f54d6
font_02_sfnt_off00013c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1