Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a43cd092fbe78d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 23:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba710fb4ed706152575245376f7ee444 SHA-1: 0a8d52ed671d1ba270712be3f3009754a7cf8b14 SHA-256: 17a43cd092fbe78de88171d32acbe21cdc05ea64f4033ed2173e5f947be1ea8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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 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://infrive.ru/uplcv?utm_term=reporting+a+paired+samples+t+test PDF link annotation
    • http://writtenmail.com/upload_images/file/72424631533.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/punewavikenirinuwel.pdfIn PDF document text
    • http://abwrva.com/uploads/files/lupowuxukuvovefoxojane.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/vitojurixovuzak.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139a44698edf---somuladajetumufaxaka.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/mevizisar.pdfIn PDF document text
    • https://profesa.net/userFilesfile/32264809464.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/93903267792.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109030441317600.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/19685110166.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/62941367217.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/lafir.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/mujelabikinunafumokafi.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/zarutasus.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/gugepotiner.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/51173034106.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/54281758863.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e38b08273---20375424590.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ef535e49---jugowoj.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/876154167.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/levilukigozazezu.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/33315053274.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/nujulokuvob.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/vipupusopuvebu.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630640592.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/53430848072.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_off0000b69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB1 10780 bytes
SHA-256: b47d123c15be477c41596f328ab4032ee99d4cd5e1cc5909de1563dea31bc543
font_02_sfnt_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 14164 bytes
SHA-256: 6e76ef7675d03c55cfed6acb524520a771107ff7d3a6a5e8419ac9867912d80f

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