Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd236f38cc5d2e0…

MALICIOUS

PDF

82.9 KB Created: 2021-10-11 18:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 49f663cf57bc3f24964826e7dcb51ecb SHA-1: 5dd39236e7ff6b3b012e536d8ba3ea0c110732e5 SHA-256: ebd236f38cc5d2e025ff8213e12d5625822b22a6ef70f4f1efc5fa6cd41a3120
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the presence of multiple malicious links is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/62513301895.pdf In PDF document text
    • http://musicpark-live.de/userfiles/file/tadixomotunilaz.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/92207022006.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/voxokorikenivawaxovasu.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/47062033339.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/zedonakevatovifonoxi.pdfIn PDF document text
    • https://bselink.com/userfiles/file/23689751574.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/97885752158.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/xarasa.pdfIn PDF document text
    • http://badgerhillfarm.uk/kumim.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/kofawabagujudoxadilefag.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615fff324b964---97748763069.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161613c10764c2---gowolovebabo.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/sapalodepefa.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/buxizesaleximiwagilote.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161457e264e19b---loras.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/51842365499.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/toluvovojimemabidudemero.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/65537953423.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/wekalerarajej.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/94479021885.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/dizamiriloferudivobe.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/61647937135.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/65543022117.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/62713412478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TSvcnjQ06Jg/uplcv?utm_term=how+does+a+compact+fluorescent+light+bulb+workPDF 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_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 17688 bytes
SHA-256: e9234b1b8de3d747f057125186133fb9cef4d7b82b7f8d35da0d86c2272a55cc
font_01_sfnt_off00010b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 11476 bytes
SHA-256: a66f81722d7eb4f27502ec9d2ecc8e00480780428b1ef95324cd2360ffb16950
font_02_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1