Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4512c44748ef85c…

MALICIOUS

PDF

87.6 KB Created: 2021-07-17 11:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f04a54b1365d48278c55d852fc275eca SHA-1: 3b41beab70ea5c27ed6d09d775d6e3b8b28bc7ed SHA-256: e4512c44748ef85c173431aede51887c088f0b591fdeda19ba9f0df744fdf42d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it is used to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this, pointing towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0ed774b8c---febirixopij.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/wapuropozuvogijokofado.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210523185844.pdf
    • http://leguido.net/files/folagosumoza.pdf
    • http://gonuldoviz.com/upload/ckfinder/files/81742101057.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d8eb081339258604bb093fb23862f241/matidepokiw.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ec2a99b037929b164ae991877fb4f940/84924793642.pdf
    • http://www.zywawiara.pl/pliki/92279093551.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/bebalenepenow.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec1553d76---48525756600.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160924eafdfdd5---zazavilumu.pdf
    • http://nfrostov.ru/upload/files/10077868248.pdf
    • http://duoctruongxuan.vn/userfiles/image/file/42125069799.pdf
    • http://parkhigh65.com/clients/4970/File/gebivatuzuk.pdf
    • https://ka-base.no/images_content/file/5443194841.pdf
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/26519295332.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b81164986---40447837021.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/21832ee7c79ee470cd46d1e6cc6a66e7/75677568931.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a32c75fd60---85248300821.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/48a29ff0dd1cc93a681a926d13868106/62479121269.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20a1ca1596dfba3d37545a28a4ccad4d/81884874164.pdf
    • https://diarch.in/WYSIWYGImage/file/dopatemafafowigavudu.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd9918b657---zujuzogejezoda.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5b439502---81198646397.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cheat+unlimited+robux
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f210.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 16792 bytes
font_01_sfnt_off00010a27.bin
20423730ef8417eca448b5fd9e7d5e451c09f5305bec7fe959f3fb4008fb3baf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 10716 bytes
font_02_sfnt_off0001227e.bin
a5136865545e8b7abad1d6956154d927f650f794f7090006b0880660206de344
pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 17832 bytes