Malicious PDF — malware analysis report

Static analysis result for SHA-256 9026a2db21ced085…

MALICIOUS

PDF

77.0 KB Created: 2021-09-23 07:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a6168eada853ccfea309c58c433210b1 SHA-1: 89164e5b2444281d1c028e19a6dbc365146c2a88 SHA-256: 9026a2db21ced08529eb8d7c1e63266fa8f7c2351b0e55b4ce4ef327e5a3ff7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The use of 'utm_term' parameters in URLs further supports the idea of tracking user clicks for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://smidgel.ru/uplcv?utm_term=cara+screenshot+samsung+galaxy+core+2 PDF link annotation
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aeb2f05c98---jawedamum.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/30848393011.pdfIn PDF document text
    • http://apvn.info/userfiles/file/vemibo.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/84823584846.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/82249242154.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/613281500.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/xorijivibelomanesu.pdfIn PDF document text
    • https://12waktu.com/contents/files/kotog.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/vazuwusosud.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/vadegipimozonedazam.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/viwapoxabawafaxunux.pdfIn PDF document text
    • https://bak.vn/upload/files/jujidilo.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc6f2ee95---17148229731.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-11/20210911022242400820.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/38546568360.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/98023125e1ab7653988235773932762a/refakogura.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/19621295080.pdfIn PDF document text
    • http://chemicalengineers.ie/images/jozuludabo.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac28963da---37727589163.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/27415660543.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/mojamixeg.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/rk0vqv45mkkjud5vkdjf1n2ik0/68044235491.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/54265345226.pdfIn PDF document text
    • http://imoroz.by/upload/file/silekatajafogajo.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/xitowuxiwasikulelezisi.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/pupepeguritufonira.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_off0000c931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 16740 bytes
SHA-256: e63bd8f1d55b25373fd0a47eb75a292d6105c17f7637a49200b8d52a2414e861
font_02_sfnt_off00010c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 11052 bytes
SHA-256: e16c042f02dad6d36897190b87852123061fc5be5bbf6a540ea45e59b7c4ddb3

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