Malicious PDF — malware analysis report

Static analysis result for SHA-256 3476928b2f6cf07e…

MALICIOUS

PDF

86.8 KB Created: 2021-08-16 07:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 08f4e685d4593f18320a8bcbc9c06e2a SHA-1: 56e68c842bc9f23095f9bbfd2c8098d430a0690c SHA-256: 3476928b2f6cf07e50e1566b8913bf4e9c34305ed34a3fc829ff38c33f018d92
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of its suspicious nature. No scripts were extracted, limiting the analysis to the URL structure and PDF heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://amzentransportationindustries.com/admin/imagetemp1/file/3578145318.pdf In PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b0015011---46126912044.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/fapapiteluw.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/kepanixapukonizalozibujag.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8885c363a4---rikodutonalosonoxu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/7oaoqj54cmbn34mjabo3eidq97/patinapetanepu.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/suzikojutosoreduvikuzi.pdfIn PDF document text
    • http://iphysiology.ru/upload/witawexagejigidifizaman.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/98488236541.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/maxuni.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/damedup.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/67848602334.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/7ad6071485171a820657b70606705612/68371607624.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/talupijowefaguwotadetafi.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd284a94185---78924200037.pdfIn PDF document text
    • https://soechi.id/userfiles/file/feriwabix.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b714ed6377b---niwamulonapo.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/zorejukepe.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/72395692444.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/85118860618.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/q562b8jv6fhmjhhm496qt64op8/lemesurati.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/mazuxesutewusavifiki.pdfIn PDF document text
    • http://setadijital.com/img/userfiles/files/84474967056.pdfIn PDF document text
    • http://vo23.ru/upload/file/62806779225.pdfIn PDF document text
    • http://www.polni.si/Images/files/15059032648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=la+vida+inutil+de+pito+perez+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_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 19396 bytes
SHA-256: f7bcb2a228b1923672a4dcd3d89c181c6027991c7e4925f476ababfb2ec2dc2f
font_01_sfnt_off00011b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B33 10504 bytes
SHA-256: 55b682e2a5e2ca86a6503a329a77bedfd794ae5ca0758919b79af150fcb8d9da
font_02_sfnt_off00013333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1