Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4eec2a7cda4ea1…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 13:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b311fce97b89bc77929549a8613bab08 SHA-1: a956672b00694a949f0640b5b35e6ff54024c1fc SHA-256: bb4eec2a7cda4ea1a552219cd60c202ef2b00575da11ffce44325ca59e0fcf4a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the nature of the linked content suggest an attempt to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tttinox.com/upload/userfiles/files/312772127.pdf In PDF document text
    • http://club-integra.ru/userfiles/file/jireruz.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/luwike.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/81554065686.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/lagedutojaluwojajeve.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/50455269346.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/49660577759.pdfIn PDF document text
    • http://ipllaser.in/uploads/92740505430.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/vapaf.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/bupumesas.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/diwuzedujajutepe.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/77504449127.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/kamararavomototukaz.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/93856111576.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/zudaw.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/38875057593.pdfIn PDF document text
    • https://network-italia.it/file/dareroguguxu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/15566620558.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/gelozirudatefixadomixizu.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/bemovemukaxararofipikam.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135aa6d0348f---5220094729.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210923171625.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/34344d38509c5f956eaec0e1c8d3795d/logadakimop.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6cb5f1bd---49181693362.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/53257924554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=androdumpper+latest+apkPDF 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_off0000b384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB384 10636 bytes
SHA-256: 6262207a05416c41396c6406d129580b7a2508efc1db1a1440ca2b7755fe133a
font_01_sfnt_off0000cbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE0 14804 bytes
SHA-256: 2968d6da62eb20e6147c98b51a8d71b68e192da22f9205d8805568412143ea15
font_02_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.