Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e048df760c8ed7f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 13:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c3a8bf9e908b2eef61f8afcb8a4c7526 SHA-1: b201db9d5af450a1f91fbe165731965adfbddea1 SHA-256: 3e048df760c8ed7f1fa6d0a7a6e7bc3368cf188cd5c5635cd4e6ae51ea57c428
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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=linux+programme+auf+android PDF link annotation
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/wototigozerurosebapava.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/49316309230.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4edebcadf---35542718172.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353bf5b2e13---lodokudurov.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/57477265199.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135e38f422a0---2453367118.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wawaralusetaboxiroxu.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/505ce3b8ae2ca4a2b39b3a4e5e93aa08/puvumo.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/495ab10495d5e770359a0770c5cdd4b9/mefig.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/12090037072.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/didafep.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/tudini.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613decd104d34---lelajemeviwimu.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/a8b8lhh8vhkvlst32n0gsireiu/genezuwejipoxikovumobetip.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/tejajomi.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/remizi.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/78445110931.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/77753699077.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/nabafovudusarobuzexapi.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jijabetekifomupumagotax.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/82448005516.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/57048203096.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_off0000de5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 10688 bytes
SHA-256: cc11ae92f77a635d7135acbc5ee98b7f14ad3db764550a329901de6892dd3a50
font_02_sfnt_off00010ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 19140 bytes
SHA-256: 65153c694c4343372b1393407dea73e8bd55faf87edff076d2c8d4787e292ffc

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