Malicious PDF — malware analysis report

Static analysis result for SHA-256 c627e9f21b5e4b2d…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 01:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 481001df1d1f75a78ea1d40565777a76 SHA-1: ca441fabfefcf9f3815fd3f85295f652432af90b SHA-256: c627e9f21b5e4b2d23c313ca26546bec38766eb72655b780e5fc68e62c7d054b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely to direct users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://infrive.ru/uplcv?utm_term=is+white+rice+good+for+kidney+disease
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ebce56ab4---jilinovoret.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/655942c9c40f680d23f722d8247355da/goxozumet.pdf
    • http://garderoba.sk/images/_file/pedavaforadasa.pdf
    • https://steklo-shik.ru/userfiles/file/17124753472.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085448272d2f---dopiwezawatudalisame.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0de53312395d8cc0198645c024ea6715/pekokinenisilenetuneru.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/71887e87dcb7aff979a18c71fc20d1e2/68941856049.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c4207457c9c---pogesorinonunepa.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b71932f1b---93182809850.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16099ca3b34fe8---60150164487.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/38697ce2f0c03c16ec4368f0a2b8a250/lajiririvoruxet.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd03c6efc2e---10168805665.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca3bfe6187---nisaro.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9fc6817d0092ccd47ed24c8626eda4df/39497551070.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087cee99d4a9---91880757692.pdf
    • https://aokman-drive.com/d/files/85725949549.pdf
    • http://curry-box-deluxe.de/userfiles/file/defavefusilamegatavuvog.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb14419d6---gelivir.pdf
    • https://sunarchegypt.com/userfiles/file/51433925776.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/250202340b24c6434c48ebbe13abf90d/36882929442.pdf
    • http://shuswapladystriders.ca/userfiles/file/kuxifizogavesawitug.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/4c6f9741b3aefe8128d29a3a3d8f5a55/kizamakawe.pdf
    • https://clubesolbra.com/uploads/files/54273626550.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73cf6660f2---58693314372.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b6220293072---95722176952.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5a6ee69ee---potomixosesemuxideteleke.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f762.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 16792 bytes
font_01_sfnt_off00010f79.bin
9f9d60d9c2029fb5538d8d0208fdeede6fa41388f2da58b0cb086f0392645a69
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F79 10952 bytes
font_02_sfnt_off000128bd.bin
96ade599cb75a16728359f40427d74f6a14d838f1edc5814c272248796a56f40
pdf-font-stream PDF embedded font (sfnt) at offset 0x128BD 16904 bytes