Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b29f0f0f7d2a99…

MALICIOUS

PDF

75.2 KB Created: 2021-09-20 18:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 490ff305a8f8522e9435cad8f3f131e0 SHA-1: 7edbd28a4cacb515003628b73c3d68168094a3ed SHA-256: f7b29f0f0f7d2a995f3e33e1d394f8a4f290ffec6ea1e70b8d50b00071cc2410
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites and disposable hosting, likely serving as a link farm to redirect users to malicious or phishing pages. The primary intent appears to be directing users to potentially malicious download sites or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=stats+zone+app+android+download PDF link annotation
    • https://tndvn.com/js/ckfinder/userfiles/files/kezopigofifusajazoto.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/joritududeborubil.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/jofixawemaxosisigo.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/logitofuwalot.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147a342527e9---tojaferora.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/61264415410.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/saxigizasokiniboj.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1df2d0b8650c449b5815f4a4e097419b/75899932529.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/fonazina.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/judafoxomedopasi.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/juvurufixajexopotoxilupip.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/41846982472.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/wodadologarazupilezipapig.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146027d27f17---xelitax.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/14810298705.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/tiguzikebomesow.pdfIn PDF document text
    • https://mkart.it/uploads/file/rusopume.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/66082286543.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/19379195819.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/lasavebenobokov.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/44065852858.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/80897439976.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/munomudukijowu.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_off0000c2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A6 17032 bytes
SHA-256: c3d07f3605ea520509977b2a25bb85ba956d2bc669d13df69a70be93671c3576
font_01_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 10608 bytes
SHA-256: e744704318bced085d165643818234e55ec88f885697d9ed0832cd12ed130571
font_02_sfnt_off00010778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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