Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97e3b39a63c7bca…

MALICIOUS

PDF

91.6 KB Created: 2021-09-05 17:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 635d2466ed256182a7441041f872020d SHA-1: 8a151bc30b5e18f3e8bb2c402bc86c13c65d8ea5 SHA-256: b97e3b39a63c7bca85f6c60af1a4a80b2314cde8cfdf7ea857ea7aedbf1dfa2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=tratamiento+de+diabetes+tipo+1+en+ni%C3%B1os+pdf PDF link annotation
    • http://bestbuyfromindia.com/userfiles/file/17630598768.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/qgma6pfe1gjg45b4kkn5cael9n/tosovufatazaruxedafa.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/72247032780.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/9244034782.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/gajejolafux.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/funiganoteluworifafomep.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/nivujimefido.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/feratogoduvafasivelamew.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/sidaz.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071cdf1cb263---paretipavilemedufoju.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/26766436504.pdfIn PDF document text
    • http://fpole.ru/sadm_files/60107934318.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/939268e3300110013e5fd61d7818a136/siburikevevupabudezoxorer.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/74759178065.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/8593311859e2d9fd317f161cb974c5c2/zuvilevupemud.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/44611267808.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/11744647101.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/19896836094.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2a29a0657---73457185879.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b211f2cd33053f297e2ee92101fab200/tupazimijidagojotoluxeju.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/sifafurimixewin.pdfIn PDF document text
    • http://fitviewer.biz/files/file/rojenobuzomimi.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/famusetijulo.pdfIn PDF document text
    • https://tappowine.com/file/lorumokakipejepaji.pdfIn PDF document text
    • http://ud2-140.com/files/deroxapajajolorokuse.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_off0000fb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8E 10976 bytes
SHA-256: e4ece8add4ee4a080364682221c45dfc1473ee92c03925d9faa235c953cb54a4
font_01_sfnt_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAA 19352 bytes
SHA-256: 7efe0620e473950a1603b173d713e8a5d45c72de281b33db9acd5a098e24e42c