Malicious PDF — malware analysis report

Static analysis result for SHA-256 79805f4c90f3bd09…

MALICIOUS

PDF

87.7 KB Created: 2021-09-18 00:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 554fad29ed8fb6677673abd9a3c593f2 SHA-1: eae4724de0f76acf4e436cdfef9acc0d87d7329e SHA-256: 79805f4c90f3bd09ce16d685805455764cb074c8826976a43b82f9479b66d4bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=the+croods+2+free+online+movie PDF link annotation
    • http://wonderpanel.com/app/webroot/img/file/63378514842.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/51829365165.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/sirabetimepapateju.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/dudilenipasirepizamiwu.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/xejajatofunebugobosegoket.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/xugagekikiwopivufe.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109040226557662.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/zonofovaritojosivaburiri.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/36007309598.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/63313039540.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1ed2f72b---7081669020.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/vufovaxejugubi.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/ramapugi.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210909033615_ikbyfk.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/dopigusap.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/gowusazademopobun.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/40879172749.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/menizadirezu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fab335149---vafexawubomagefonolunofoj.pdfIn PDF document text
    • http://kisito.com/userfiles/file/33435552374.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/qfmrmcvl1f5reg0kh2i2inc3ss/nereduju.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/83283587746.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/35463588962.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/pasukepuvinomifodemalod.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450e5c6bf01---98168473313.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/sodugebekudujovinabus.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_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 18600 bytes
SHA-256: 954400abb9f7587b718e363474105c80016eec1e00773902d6d39bb07697d7cd
font_01_sfnt_off0001206a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 10628 bytes
SHA-256: 75aa3fec9be2e4c53bb1fef15b3ede7431131a9cccae1eb52a946ae86897ad98
font_02_sfnt_off0001388d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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