Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fddf5046f26c3a…

MALICIOUS

PDF

88.5 KB Created: 2021-08-03 03:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0500a2fe4bfea3b55aabc43bf06b5171 SHA-1: 1e93279b7bf78d529c1b390fcc202a8084cf2deb SHA-256: 99fddf5046f26c3afd58b6b96ca29c195c87b208569d44c3e2623db1df83052e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads and disposable domains. No scripts were extracted, but the presence of numerous links suggests an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://corghialberti.it/file/nigomire.pdf In PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/rv05as53a50374kkd93l2vapj0/12532135028.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/wiwijifukomowiloroke.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210728155831746.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/2725070468.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/48d3827d34eef09b6ead8f44b574b4d1/51515308243.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/78635870315.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210703_225051.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/15ccb6a34d51b73c3634d77c355f03ef/29839866664.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/gukefadejabave.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/r7c948etr9k6oj44p2v86u5nn3/64214185175.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5608d8973---godovimu.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/muvanejajuduraloterop.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/lixiwatavut.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/mikobegi.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/zaluwaxi.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/83388305569.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/9e0300c2e3b3d891c85c79dcd3c38813/sajevudozaraj.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/ragixisovedulexu.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/0cdbecb921c979393e69dd0fa2197a8e/66343346276.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/zitivemesezorifesafu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/5kh2u27kkktvu2go2jn0q48716/1811321089.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/731a32010fe678a1b53c8e1468c3a5c7/80157868613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=para+que+sirve+el+te+de+manzanilla+y+canelaPDF 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_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 17460 bytes
SHA-256: dd927ee27ecce5849703191b1afd9c79a6794d01ad7f344f218121b9e4d96a22
font_01_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 10896 bytes
SHA-256: 0c3c8d5e312522ecaa2c1c6ab1db9b5502a649be64d4f702764fbd7ed8db4cf8
font_02_sfnt_off000139ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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