Malicious PDF — malware analysis report

Static analysis result for SHA-256 d782f40718921328…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 12:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b32081dd2c95360ec49ac54f23f1aebc SHA-1: 82b3a6e1a1a8849fddac34eccc4c94fc4c2b52e1 SHA-256: d782f40718921328846ffa033ec78ec8edf076567869829b3f2d72eb65fedea7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://sonnenheizung.ch/fckeditor/editor/images/file/buxozukubafojifitoxelolun.pdf In PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/ketozegozowo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/kcd6u2svqhrhvgf4ratappcke5/fabusebifawalofolidoge.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/gimilaxofoxewagav.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/niluruzalatigereda.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b59e05b9a---fegojusenex.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/roriza.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/linevev.pdfIn PDF document text
    • http://etkenkalip.com/files/lubasowomakukapexedok.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/rijifamekaxowujelavixe.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/rofoxumaf.pdfIn PDF document text
    • https://12tiga.com/contents/files/nasatureton.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/84922427761.pdfIn PDF document text
    • https://digireg.li/upload/36343715683.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/gidafidip.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/fejimowedarubowijifozipop.pdfIn PDF document text
    • http://superazs.ru/images/news/file/70446326821.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/tibimo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6b5250d0---namenodugixizubesozul.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ae69022eef54cae0d1fb990d0fa7d36d/senotodudanomajojojan.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/98039604895.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f5d0cf4b8---62825166267.pdfIn PDF document text
    • https://terracell.pt/images/file/30047611197.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1ae84a774990dc6c7c3195b2d7357697/11884429755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=crazy+stupid+love+movie+download+480pPDF 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_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 11416 bytes
SHA-256: b34004721764800a60089fa5f50b513ce935784b9ad92258a49293762f50fd61
font_02_sfnt_off0001123a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 18112 bytes
SHA-256: 63065534c2b63c9c6eddeaf901e5e6d3bec7bb8a0558f89c11b977d8d94f65ab

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