Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98ca1829bf459da…

MALICIOUS

PDF

75.2 KB Created: 2021-10-04 23:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 10188a375df24ca3ae3438c2ea315a4a SHA-1: 7b09a06ef98be0605b8065b7f00b07c5114c2961 SHA-256: a98ca1829bf459da162f28970a09aaa7e41a287891d3ff625fc8d32bbc6cf53b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains an embedded JavaScript stream and multiple external URIs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=agree+and+disagree+grammar PDF link annotation
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ef73fa5fc7d528a2d3b642381c4b5e48/zirawidog.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/vpkadjan7adspqlsjuv4ocb04o/34121305268.pdfIn PDF document text
    • http://blccy.com/userfiles/files/xogux.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/71631508813.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/nidawugo.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/boniporonobizugumoziz.pdfIn PDF document text
    • https://biomisszio.hu/tmp/fifof.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/38490342745.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/riran.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/17532965970.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/nijajijemelesul.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/juzuguxu.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/88925300107.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/7710969224.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/losegebowodevaloxir.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/60001378208.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/rutagojoj.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/pubaverakupogasuzel.pdfIn PDF document text
    • http://debo-fit.be/userfiles/file///77040982132.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/36615054256.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/78go2rkf3p6mb1h26pmcu2b4c8/voliretebirosebugo.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/tuditodozefogu.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/setutapaxatoluruxitot.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/rikikinapuwuwufepilopeliv.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/82681188778.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_off0000c506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC506 10308 bytes
SHA-256: ff125580868f7c8da04ee7fcc1fc30b7b76b13f8e8defeeb7ad358c0f0e72669
font_01_sfnt_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 16860 bytes
SHA-256: e5066a5a6cf70e9e0e0dfd4aa132da5885bcb9ef903b2787875dd3af21372e2b
font_02_sfnt_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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