Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d214a659b6dc4ee…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 22:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6acd047313f4e40d6116bded754f61c2 SHA-1: e28e86ff9ffbd6345809ec8ebc761f9978c7a49d SHA-256: 4d214a659b6dc4eea87cae751d93d2e1f72552b4ef3f9f5470c040ac1e45d4f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=thoptv+apk+dl PDF link annotation
    • http://liavanhaeringen.nl/userfiles/files/nuwova.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/51307288739.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210903_9_16_5.pdfIn PDF document text
    • http://atrsara.ir/resource/files/momoniz.pdfIn PDF document text
    • https://theipbuzz.com/images/file/dolodudenokofigepipisosa.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/wotelojikubugorimesise.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/ziwediwejizowurimigofomi.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/lonijubexixafiwaz.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/70996579996.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa81748c7---wafolobosivagegokubuwule.pdfIn PDF document text
    • http://sro52.ru/uploads/files/90948877172.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ggbbovq4v5do912p6013um6jia/zademufos.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/fofeporobax.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec097482fb---lapusodadu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/97353455975.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/22108540022.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/54313343790.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/58192578925.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/remosarefefamexavipin.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d1c75eb2d---10795937149.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/14864403016.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/memito.pdfIn PDF document text
    • http://newworldss.com/uploads/file/39160174020.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/newitekixamajafobo.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_off0000b39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39A 17684 bytes
SHA-256: 1a7b3d1ceec7a06e6c5b2e7ae6ab9841f348579395d9647962df77436d99004a
font_01_sfnt_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 10016 bytes
SHA-256: 6775cc2eada6399c9249f156fc6bacc3282037266eb2992ffd73d5d236cf6623

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