Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c73d3db39a88bf…

MALICIOUS

PDF

105.5 KB Created: 2021-09-07 01:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 562d90dff4b28ad64fd198595b9ed9aa SHA-1: f069b81d21b7f3a6fc8d3a848c63a52f59e1d31c SHA-256: 04c73d3db39a88bfbc19c39360e001690ba53c971eb8127072160c37d50e68d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, indicated by a high number of external URIs pointing to disposable hosting and compromised CMS upload directories. The embedded JavaScript stream, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality by facilitating redirection or payload delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=importancia+de+la+fauna+silvestre+en+mexico+pdf
    • https://securitydm.rs/slicice/file/53084982326.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/94d67b002136af43eb92b948a387df7f/velik.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767905c1f75---dipugiteropigafu.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a85e2ddcb---62871912916.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f95a8f40d2---90090303922.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/wugas.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8kcherecca42g0ngeprm506hs1/24405942833.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719734ddddb---60739925273.pdf
    • http://antonellascarpittadesigner.it/userfiles/files/wemezusimatoj.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609776d3f3f7a---diwetumeteta.pdf
    • http://csc0532.com/userfiles/file/20210724205320_io0ah7.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/enpumbfif1op4l87dc928lajl3/19519797241.pdf
    • http://hurtmar.pl/Upload/file/56198563705.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6d75fa374cd8ed868a90f2daf101f2cd/3378202527.pdf
    • http://albino-pitti.com/pub_img/file/2043066369.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f17a4f8f045---6106549149.pdf
    • https://a2designbg.com/userfiles/file/5145063831.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/tanujoxejalejamavunefiw.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/39jgkalkoj2kfv9qqmpptm69tr/kavif.pdf
    • http://brlairport.com/images/file/79486593144.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970418cd6f8---98109138100.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_off000130cd.bin
7fd0389cc1005ad70c28d507924d864825bfa8daf11e92f4e773d2d28129ffde
pdf-font-stream PDF embedded font (sfnt) at offset 0x130CD 11000 bytes
font_01_sfnt_off00014a5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5F 16792 bytes
font_02_sfnt_off00016271.bin
897d08c0b874f25a11f4e5ae21a64ba6c4f73283ec000c780016be00b5fa982d
pdf-font-stream PDF embedded font (sfnt) at offset 0x16271 21256 bytes