Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf25b56fdd43cfe4…

MALICIOUS

PDF

69.1 KB Created: 2021-09-13 10:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce58ea9f43ad332317dfffc1743443bb SHA-1: fdcf607917cf86cdd8b2a2928094c8cb5dad1c27 SHA-256: bf25b56fdd43cfe42f00685dd30f42b7ffb001e7e990bccdfe3c955cd7f8b82d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains. Heuristics indicate this is a link farm designed for SEO manipulation, likely to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bouwbedrijfansing.nl/userfiles/file/muvile.pdf In PDF document text
    • https://gentrilieu.vn/userfiles/file/33889107677.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/divetepefajinamerudorugi.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/miwij.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/jogug.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7cc19e0a350cfec4937419c61a0dd7c8/boditajuvamabadarusuxo.pdfIn PDF document text
    • https://domilot.com/uploader/files/puzanone.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ba1b42fab4---nusoximuxijaridul.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/guzisasov.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/lofirun.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/lojinido.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/mazur.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/22453205627.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/51380313642.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/dujigisesufit.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/32798995151.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e822f96b7a---fizafegodiwijolimewe.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/56353728645.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c4b2389e2ef95c0cdd62e00eaa736bb2/getarejobemubovemej.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/bikudusugagemiv.pdfIn PDF document text
    • http://zerosquareonline.com/file/renurom.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/zofozudiwimavowagosamuguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=onlyfans+premium+linkPDF 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_off0000b1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 14732 bytes
SHA-256: 0257173aa7c6fac06405b77405884b571187b50f163ca022a66b1d948fc41c8d
font_02_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 10632 bytes
SHA-256: da8b009e31a368a4bdf71038fec090c8f7ef549cf1906ea9029777df6f421e62