Malicious PDF — malware analysis report

Static analysis result for SHA-256 30dcc527bd9f691a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 18:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e856af4e70d7089e61164cac7c660631 SHA-1: 056d3d137e73583e09fbab8bfe9751b5ae1ee0c7 SHA-256: 30dcc527bd9f691ad758e9d94d56d311445f073c1df9d2ddcbe70f94a86ffb07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, disguised as a game download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crysiq.ru/uplcv?utm_term=super+mario+game+download+for+windows+10+64+bit PDF link annotation
    • http://eva.am/files/f8d7e0a554a9b90f.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/2bcea66e59ea2d40f731b36e2481904c/sobuduguzekegudi.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/zuwul.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/46501084753.pdfIn PDF document text
    • https://aayams.com/userfiles/file/67107094998.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210913173703_u4ocir.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/76436558707.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/90300634827.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/67123189295.pdfIn PDF document text
    • https://ksboutlet.com/file/files/4024106075.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/88821446525.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/gunivilagoxim.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161380e676e7a5---40096081031.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/zikekotefavugopidadisuluj.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/77506608755.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425c42f3dc8---30902258888.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/30503795789.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/82928934264.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/dunokabufe.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/jukoboko.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/56183345302.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/38472042367.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_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 11664 bytes
SHA-256: b7a7b77251e7a0ab36646a79e8e469fc6d2297b36e31fbc7ae3d8618ca133531
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 17800 bytes
SHA-256: f92397edbffa6cd0c757c31bc499e3759a53fe4e1c1b53519c75ea24ce38932d
font_02_sfnt_off00012c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1