Malicious PDF — malware analysis report

Static analysis result for SHA-256 8100b3c31a3d8fa5…

MALICIOUS

PDF

78.7 KB Created: 2021-09-15 18:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96b2a4d74c8e2ecac6bdebd452323af0 SHA-1: e6b193fbd851e91c21be576cc462a39e78c88ac7 SHA-256: 8100b3c31a3d8fa57dba9174cb42cb67953b14033989570c08c19c5354a32a7a
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 external sites, including those hosted on compromised Content Management Systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The presence of 'utm_term' parameters suggests a tracking or campaign-oriented phishing effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://synerhu.ru/uplcv?utm_term=valtryek+v5+code PDF link annotation
    • https://widerbet.pl/userfiles/file/54345324102.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6f21b35d---tatudujas.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/polixawufuratigorapire.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/38102012814.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/xegegu.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/84998579166.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/1447501305.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614014a5601f0---fefuvurujefibijanuwuxima.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/kopapejoje.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352fa55caa1---25668950394.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/lenuxitifegimosopiwusekaz.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/58119470003.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/80281320108.pdfIn PDF document text
    • https://pindimana.in/uploads/file/gifodesad.pdfIn PDF document text
    • http://lex.tj/img/file/99664581956.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/nagosixazosikuromufokuku.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/mizakoxojugexenoweziwipu.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/66270464685.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/f0nq7hk3j1rs2m62br52ufvjdn/dewifufu.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/23999936161.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/17346770297.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sogubetepinikivepija.pdfIn PDF document text
    • http://baove24h.org/upload/files/kegemufakutokujamog.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_off0000d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 10372 bytes
SHA-256: e90b4a7b4c2d184324d5346d3e9b83c7d15205210685f68a92bb82241a7efe21
font_01_sfnt_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 17584 bytes
SHA-256: 3f98c014e130185bec67c50793f9bcad12762bdccc2d442d3e2856d9b8250475