Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b68d8c40d635099…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 10:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55a7a5b792a41e3f4e9c8f1cb35ef1e1 SHA-1: 1436fde680e485648a00b94c694e265b8c8c1f36 SHA-256: 9b68d8c40d635099e4c63cf1e66a794f2ce4337cb5da2ef96b9d1df8ec581b11
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to disposable hosting. The ML classifier and ClamAV also identified it as malicious. The embedded URLs, despite some being marked benign, indicate a pattern of directing users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://edallyshop.com/upload/files/jetitiw.pdf In PDF document text
    • http://phdpecs.hu/userfiles/files/5042061491.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/64278898998.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/55000812467.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/livigosejatebopimusa.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/lajuregepasasasikulazo.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/pexob.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/lebefetanugas.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/84396960411.pdfIn PDF document text
    • http://telektrans.hu/editor_up/wevuvuvikoteninematufu.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/98847608841.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/82992811920.pdfIn PDF document text
    • https://orangerun.re/photo/files/pexorubopotawigafaraku.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef8ff1d119---5475092846.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/77fdbc8139d06a9518531ac8159cb6e8/mopovofadofatamenim.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/fowagipuzawilozu.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/sufunade.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/996919d50b67c49498657a041c12d4d0/fibibutudojojupirotuwetix.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/vutovedejeselelew.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/japadalozolu.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/menemexedexuranel.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/46459767738.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/44504301295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+mirror+to+windows+10PDF 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_off0000b1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D1 10312 bytes
SHA-256: 4e87834006476fdeb9008b7fd78b803ff61ef49b4932650f31ea026e86552af7
font_01_sfnt_off0000c91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 17700 bytes
SHA-256: ecee0e1c92a5511378693bfb9f2bd5d5b23e6bf54f27738b3f99a5aeeb1b53d4