Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d6d30a83f8b7ac…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 02:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3368a85c25e89ae036a116ce29f615cb SHA-1: bb21d1c7234de7f014d54763fe35c4f97d930308 SHA-256: 83d6d30a83f8b7ac22c766b3eef7bc1a6c551c6b21084f072d00c717e5b69fff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, flagged by heuristics, indicates potential for further malicious actions like downloading second-stage payloads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://synerhu.ru/uplcv?utm_term=all+downloader+vidmate+app PDF link annotation
    • http://wonsakai.com/uploads/files/fijobigowafikuv.pdfIn PDF document text
    • http://vning.net/filespath/files/20210906190351.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/18021176223.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/60153311060.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/dezufikawereborukijav.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/75165761155.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c387f2e89e---15665283873.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/bixogiruzanixe.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/wibakotajesaxuzeti.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/xifosa.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/madovokoluwiwogaxoj.pdfIn PDF document text
    • https://socardan.com/userfiles/files/gijubugoliw.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/musidupibeliporuveb.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/41850751316.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/68451311833.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/gapitixitanoj.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/nikerobuzadizebajuzuk.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210918162925.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614241b80abe2---52181654657.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/26151695346.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/95827727456.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/miwazazudadipuma.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/zeladijaxawor.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/jagapabezurigafup.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/46069066885.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358959b78de---56477721924.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/21018436897.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_off0000b5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A4 10520 bytes
SHA-256: 2fbef9edeaa8ec4bba72cca0b00ec25905008b83abb13cb90477557190a2a628
font_01_sfnt_off0000cd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 17272 bytes
SHA-256: 20a8bcf90f55c15dbb9d322c974eff96dde26bb77251bf7338ac17cdc42458e9

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