Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ec39706a144aff…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 11:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc9dbc222d5cdc5ca73720b1e46ac75c SHA-1: 8e6a522b5a185bbd7badbc910694ff475fbc00a0 SHA-256: e9ec39706a144aff7feb6678a34068e36873fc75786166de4d9919e0444d1093
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to compromised or disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://infrive.ru/uplcv?utm_term=watch+live+cricket+on+phone PDF link annotation
    • http://otohondamientay.com/upload/files/42119888651.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/lepaziriwapamobimagapifep.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/83894759363.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/dukabizanelizonipu.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/zegozobatogatawonesufas.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/jifanu.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/16108232991.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e65f620bd89f21d9806f2c88b175ef1d/movozajinamozotuvameda.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6e567aaae---belafu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16147deef9a948---zovinukuwisazin.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/63044143250.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f99b8cff---60831060134.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/310760692.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/lisejozogegobelo.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/sojivuzizuzawe.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/28407408989.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/tamofalaxikixe.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/sulizilofigokuvuwekabomos.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/pabexuvafuzugofogekurol.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/bafujusasubuko.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/48563791054.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/10247960787.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631349908.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/pinakalarag.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8309caf7bbcbc9805818c50b00356a7a/sujotep.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_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 10456 bytes
SHA-256: 8fb5ee5c957c763ee4fadf7c05d09840fe6d83947f45754e1d99dc61661cc83d
font_01_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 17252 bytes
SHA-256: dd7c40790c21da507b332854fa66a0388f64942dad9df92d4c01dc9186275d7a
font_02_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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