Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6091d6d028c4bf1…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 11:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85da482da3f4fa0674d652e3e5e16e7a SHA-1: 19ce6d3b2873966223d2f1c6fc5b6874a18c2bd4 SHA-256: e6091d6d028c4bf182d4116c93aed57e06fe4dd8f544029151291afffc383a14
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://cahayamimpi1.com/contents//files/mepoperitibulobezerilo.pdf In PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/nomapuzumisalasapar.pdfIn PDF document text
    • http://leton.pl/userfiles/file/9157334228.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/of1tk8npkcpchu32484kqvei16/momeserazafup.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/35722271017.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/jigonejamogotenisumika.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e105c5bbeb8---51325273508.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/bifirodujiterudovonevizo.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/d99fd3722e051a21ae07a1a03d06b2b0/53068293134.pdfIn PDF document text
    • http://m2m2design.com/userfiles/32658970401.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/xemefaj.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087080bed12d---29353792164.pdfIn PDF document text
    • http://dgjst.com/upfile/file/foveviwuxuvukixa.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/pusifefow.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/46119183095.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/fenetudujubipo.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/34562030940.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/32908524612.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073a881a3884---ribupoxo.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/28511642045.pdfIn PDF document text
    • https://argumentua.com/i/file/duvabesiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=glass+ionomer+cement+review+pdfPDF 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_off0000e5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 17780 bytes
SHA-256: dc264cf0e90a7e81cc44b3fd21dda4f8b1d1f3a20af209b97cc8f789f59f7b80
font_02_sfnt_off00012b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B75 10972 bytes
SHA-256: 708602fcf1a241ee0762762dda3cfa9afc72cd60933d8f844b4bddbc0303f045