Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e3f16169f0ea33…

MALICIOUS

PDF

79.8 KB Created: 2021-08-20 23:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ed60106e451055d423b617e625ab7dea SHA-1: 5b02d35f56410f93b36713c6f30d574d27ff9a39 SHA-256: b1e3f16169f0ea333acd84a6c18cffea815d5f7d69d1586a4032b5ccd3326ef6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised and disposable domains points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://queure.ru/uplcv?utm_term=variables+and+equations+worksheet+answers+pdf PDF link annotation
    • http://nakamurasangyou.jp/app/webroot/uploads/files/mijabujetezinimeraleraz.pdfIn PDF document text
    • http://aps-mes.com/files/file/tabekotatetisatidefo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab62279b68c---kufasodawijapizufawomo.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/p6cceq01mqdjrv67dhqti42q4k/17087767912.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/57956092827.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/33506433739.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/kejefezubagevotamaratida.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a9413cffe---jolixik.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/95100899485.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/13937795904.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/jizate.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/15153026302.pdfIn PDF document text
    • http://metallpress.ru/files/ruxeporiduti.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/dk3gu209ehb9fgmfml046jblp4/30430970286.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/44331184193.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/80847087747.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/p4jhlmcfcte1grtu4oi2ajhk0n/20939280857.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/pukojelit.pdfIn PDF document text
    • http://erictex.com/ufiles/files/81991239206.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7a405d065144eed09122ac640a9193ce/16181442243.pdfIn PDF document text
    • http://adveotec.com/img/file/78095330628.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb46930d14---lezigibipazabulebe.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609237e8a74a5---dawekeboj.pdfIn PDF document text
    • https://vestol.bg/files/file/noriremenojunove.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_off0000d46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46B 16400 bytes
SHA-256: ae279a0c2a5214d349f5b2ad45d58301066e1cb6c5a15cb3fac2bc7b18649d6b
font_01_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C0 11128 bytes
SHA-256: ba239fa715d5685ea45a09ca4f23debfd37100b1a4f33b72ea99dc2bcc8f57c4

Open this report in the interactive analyzer, or submit your own file for analysis.