Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ddf5de0d0275ce…

MALICIOUS

PDF

93.7 KB Created: 2021-09-04 09:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f5d7b5ebdc4747db55df068234560d1c SHA-1: 2376d0d656050cdd90d1f5723c1bc564aa7565ec SHA-256: 53ddf5de0d0275ce4016a7a52215566c0060c94d2db77a27389bb1b0c2be4aa0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=mastering+revit+2018+pdf PDF link annotation
    • http://augustaelectricalwork.com/editorData/file/58867400394.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/gujipekefoxumomexuragoxap.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16120207e624ac---pogufajikose.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/2070fefc3fb656aec6ae1ff18ba0568f/79205185643.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/futiregasupag.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/wovufapoxosonedemerujaguj.pdfIn PDF document text
    • http://vaynhe.com/upload/files/pozogibikevites.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b88df30b5f6---gekuwojizivofigimisaj.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ffba31a89a37df615747f167b27eb0f8/parokigel.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/duzikimomumometolokewe.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/xuwag.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/85d702bfe5ae19104e0eec441fce35d9/sewijiduwomo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26ffb44668---wisevudat.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/88553133636.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4c23a5bac---tiniwuvopudakagil.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/55652540437.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/88306903da2610127f64d16d363bc1ff/kukiperalokozugoxabo.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/gufotuzukomajunigured.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/71985212761.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfccf9136c---xemotodarutefunofowesisem.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/0omopljfag0tubp5ds6pk5teo3/44041108208.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/mowivominapusorof.pdfIn PDF document text
    • 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_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 17660 bytes
SHA-256: 99346e74c6777904b053e72e9648763a37e7b355f05553ae69fa626758d72dd5
font_02_sfnt_off00014f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F88 11068 bytes
SHA-256: 7c4e37ce3fef1ce5d5bcc7c07b622903c1eebe70f1da2e5e1723077bc4566e17

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