Malicious PDF — malware analysis report

Static analysis result for SHA-256 616953d9e16b5647…

MALICIOUS

PDF

89.5 KB Created: 2021-09-05 08:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf1464c24eb36da88f144ca1bcda3f72 SHA-1: b7ad2317acdaca88a36b6c40610c121f8a2a2b05 SHA-256: 616953d9e16b56476231d72262f6f299fe5cacb64b099f2ea1604c8242ba420e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alexandrapanayotou.com/web/images/static/file/40716632535.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f38af6c3cc6---27521776531.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/bazewazus.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/fixirewoge.pdfIn PDF document text
    • https://goodline.by/userfiles/file/28616091485.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/23340698130.pdfIn PDF document text
    • http://pololanna.com/user_img/files/92936902155.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/barovosegisodivoxoze.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a234fa331c0---2662751979.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/6514094498.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1622016466.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/44391276975.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/g1ca0srqvhj0dmhobjfrhjgdo9/57559109886.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16076698713681---10495772844.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/91161182388.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/75131930245.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e090a5bb59b---lazori.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/88347491171.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/sofotusajeximevat.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/74246322102.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/86166194ef9994e655e8e7e43e68a07f/xoguziwabotirenowesovapem.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/93957977832.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61c8998c9c---limizubufu.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/92404485173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=proximate+cause+in+marine+insurance+pdfPDF 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_off0000fb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 17024 bytes
SHA-256: 49ff2a88e8c24c54c313b95ad6dc9e68697fe3bc2c9ce14b3a8129a4020d0f03
font_01_sfnt_off000126ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 10940 bytes
SHA-256: b797513bb5b973e11cf7c06c99c380450042fd4ccf6233067d2abeb76697d438
font_02_sfnt_off0001405e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1