Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc35d5b4e98b4bbd…

MALICIOUS

PDF

91.2 KB Created: 2021-06-28 17:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 094fb444557022c1c0d6e6f48c59e7b7 SHA-1: 4c3b322a7a4ad2561a27b7280e7ba916daff763e SHA-256: bc35d5b4e98b4bbdc44a185d555f825246ac5b8b66b545413ee1dff1aaa61d80
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous URLs pointing to websites, many of which are hosted on compromised CMS platforms. This suggests the document is likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://nomylo.ru/uplcv?utm_term=sonnet+18+shall+i+compare+thee PDF link annotation
    • http://budoprojekt.eu/obrazy/file/kumisigolasekoxozadejonum.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/3efemm2mgo0f01v77tu9g2dkas/mejulanajobozulakesew.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/t7623ms5mmr3u7ve8una20fdf7/33046843444.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2f31f194---22457059497.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853689bbb4a---52797264342.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/65597917347.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14bfb827a---xarelozew.pdfIn PDF document text
    • http://ledins.lv/cms/file/vutasewegisebejabu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/956f090603d8fc7c936753b9c4f41b4f/5394751370.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/51430455251.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f86d52243f---jevebugodizuj.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0q8an17h24mqbgk2ek8t6mne74/xapafixawunepiwagila.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1e5baaed061b3224e12d68ecde097882/80317929617.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/60128899290.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/85144721057.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb3be2bd9a---wabebux.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a6337ae30---zukej.pdfIn PDF document text
    • https://service-panev.com/userfiles/7853283850.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/82jmk7g0b2p9240adghp1pimtm/luvanagixavomejitewo.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/zomepi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606efce9925a3---40558576424.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/aa4ee79ecd84e516a166eeb822763c0d/63281180451.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa4bc6ec8---zofasakazojetejezakakis.pdfIn PDF document text
    • 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_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 17352 bytes
SHA-256: 99901b12a82579b3ae42dbc36521095f539c3f0866a4823d1067591288263f60
font_01_sfnt_off00012e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1C 10976 bytes
SHA-256: 4c61f79417b3cb6cad09c60ddd215c1a60f09e6fb3a3f40ada81ff520c8cbbb8
font_02_sfnt_off00014766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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