Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1ef7732c22c1fe…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 14:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77cb7929f96d792ab9b8c4ccae0226b7 SHA-1: 6d24d8f93b1924f70cbc93587470e2b45ca050be SHA-256: be1ef7732c22c1fedc2cc4276a04d508612644b27316cb9b7628d75377000086
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.themixchange.com/userfiles/files/40199856758.pdf In PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/giwulewelega.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/ripopobagamulipu.pdfIn PDF document text
    • http://1careglobal.com/upload/files/16796642701.pdfIn PDF document text
    • http://samtekelektrik.com/files/maretovivekav.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/rasetup.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/vibitufifidefalumovo.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/kosivuzonixodanoxiba.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/02ef992f65db391e3e01f521e186874d/4790446129.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/mabigeviwam.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324caae6cf0---65786357003.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bdac86f8d---niponabogemapuzitasitixad.pdfIn PDF document text
    • https://digireg.ch/upload/lufiwefuxeketuwu.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/9407460920.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/25584910410.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/bokogevafumomen.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/40257684922.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/87069983488.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b475ee572---sosibe.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/43348981406.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/lelexofuwuxoz.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/wugamiluzujulun.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/18368953971.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/voxokinalulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=make+audio+recording+androidPDF 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_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 10420 bytes
SHA-256: 2af393601f609dbbbf8256305ec2e9e1cbcecf2389c4faf1359623a3aff3ff8d
font_01_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 18964 bytes
SHA-256: c5ce6f73d2f943c1547d15b38ab0ef126058cd8f77f878f94d0214f7e82f107f
font_02_sfnt_off000129ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1