Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0d545e818a1b6a…

MALICIOUS

PDF

72.5 KB Created: 2021-09-03 23:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1f8b3ae2cf90f403ed0e7a0adf7da3b SHA-1: 1608deacabdad4050c685a8556ebbc5d63e00dc4 SHA-256: de0d545e818a1b6aec4f9da4ae210f1c029517e32b105d16a95a283b37d0abb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being part of a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs, particularly those hosted on 'elonsummerstorage.com', are suspicious and likely lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a122136df31---64214272944.pdf In PDF document text
    • http://sciattella.net/images/file/35997112602.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/dakajabirubabekefipebi.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/2lerjn94iemvc468ndfafuvnht/61202841074.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/lesejajaxuvopitinisot.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/8o0tvjaru3tkmdnslolfsq4mc7/wiviwe.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/nepagigutumusefexugumomik.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/823aacd37c6b6e23c70d16cef9b15ea4/88413204146.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/14290270795.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/47362418416.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/wolopasunadezilawavedimol.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/53715525680.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd8b53311c---zidipisivumuligulig.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/44008613898.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/vazuseda.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/50723f8e65a92201c780e200f60c4ef2/sevulovulu.pdfIn PDF document text
    • https://spacio.hk/attachment/file/46189581954.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbba021a41---94137550045.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/7997962778.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/5385915102.pdfIn PDF document text
    • http://chengzechem.com/upload/files/22077056694.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/28934908147.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/59500436730.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba64a2ff4---lojosev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=whatman+filter+paper+catalogue+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_off0000bc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4C 10992 bytes
SHA-256: f55877a1f4a42d774ae59ff95967ad9188ff8e0f6a3cf5b1033bfb7a1f886e08
font_01_sfnt_off0000d55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 15248 bytes
SHA-256: 4158641b9254c5f35588735590191485397581bb3645164ca8934d84f26055b3
font_02_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1