Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dddfe93f124a8c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 16:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d803ba9ea28f283545a066967914e35 SHA-1: e55684175a26394382bfdca787fd2116744599e5 SHA-256: 99dddfe93f124a8cdb40534934dd8bb4f87806b4ec19cb7a6be92dd6c9e32ba5
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories. The ML classifier strongly indicated maliciousness, and the presence of links to potentially compromised sites suggests an intent to redirect users to malicious content or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6e3be10b70b41be4c51bf0da9e3fa6bd/50684796212.pdf In PDF document text
    • https://fcimoveis.com/imgs/file/fepakekuwax.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/nulidimadetitesejixe.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/69095039966.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/21983267978.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1031d4e14de28e9c20168dd2cc2917fa/gafiguvisimo.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/bazobapogapasa.pdfIn PDF document text
    • https://wsbtitan.com/images/file/2635512133.pdfIn PDF document text
    • http://licausi.it/userfiles/files/19667351854.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/5534616810.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/45026071851.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/27890129574.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132135ad2663---23748432120.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/kolalezaledufabivikar.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613967d450c17---33702808505.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/wevirigosasuzo.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/42297322923.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/544899671.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/gaderaritusatokexukokize.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/defomolalenazatezol.pdfIn PDF document text
    • http://stylekd.ru/files/57943342401.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/76630576014.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/97788359226.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/sisaxogivutagilaruxepifi.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97668254833.pdfIn PDF document text
    • http://badgerhillfarm.uk/posub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=easy+unlocker+icloudPDF 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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 17860 bytes
SHA-256: 1651c3d2b2498fc804c7a3feb8ec48d03b4839e4f9d4692c865e2753db29b657
font_01_sfnt_off00010b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 10556 bytes
SHA-256: 0b01a6f1256dfebd4d7f16e9518e58c20eae1c109a3eaac1f31529eced602d5f
font_02_sfnt_off00012373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1