Malicious PDF — malware analysis report

Static analysis result for SHA-256 5638a3e30b7a9bbd…

MALICIOUS

PDF

76.9 KB Created: 2021-09-24 23:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 01eb76619cb4baae1b9fd37c5a701b06 SHA-1: ccc272f107b545f5bfd2d6e86ac8c21126c70011 SHA-256: 5638a3e30b7a9bbd583ead07c15cde098ce399a12e765a5b300c0f5bf8d42621
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a malicious document. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggest a phishing or malware distribution campaign. The embedded JavaScript likely serves to download and execute a second-stage payload or redirect the user to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=rocketmail+mail+sign+in PDF link annotation
    • http://tythb.cn/uploadfile/files/75564617094.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/49561162750.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/pagulemajafisiwexajaj.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/wuwokegi.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/vujemekupujepox.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d3876a516757e57710f143e027df2d84/nasutabesorezim.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64218369296.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/wemebub.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7f41e10e3a17c883a35ee17d22f56601/10443702685.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/36714242697.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/mazapebu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/gupudufudinotirew.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pufexamupogasepixafivovaj.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f1b1ac17---89362800529.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/45132451970.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/157635286.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/xipiwitajeviwiropenimob.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/derivulesufuguxedezoluse.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/82476374042.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9f476a93c---zuxitu.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/suromidojafomebuxarimo.pdfIn PDF document text
    • https://sardiniagreencoast.com/userfiles/file/19761631833.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/gizoretagafurakenejoxipug.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/zolawebobokizozapipituvek.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/64077330254.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_off0000c577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC577 10608 bytes
SHA-256: 5fec2d97c55f1494c78ca725b3c3acbaae1161a1f907cf2558bb364aa7591f91
font_01_sfnt_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 19000 bytes
SHA-256: 65f698b55886100ecee769fcec50c2008280add27ecc2540d5fa300454219ce8
font_02_sfnt_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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