Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d7ee29397de8ab…

MALICIOUS

PDF

85.2 KB Created: 2021-07-04 02:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d0f1de80fd8184c8933c3d4201471e9 SHA-1: 21d741acfc62f33f7b5f0686d062199e13e53e25 SHA-256: 57d7ee29397de8ab1c368591fb22991d1d28d353964a4dc02873a9f4b071a628
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://medvor.ru/uplcv?utm_term=intraverbal+wh+questions+list PDF link annotation
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2c1e28e94371164b321d37f61d1ae269/40228655582.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/gaduraw.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a4a70f5e---suwowi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cd04a4d5f85d33e22b7c9ba6ba65da5e/15547758911.pdfIn PDF document text
    • http://mylodge-naoshima.com/rorebiwasewarojem.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/kodakipilolinubevojafi.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074215fb3493---jezazevijepidudegim.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fc1f16a06---rakaxamikilituwurimabiju.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5831cb9907e770c881d8b69bc66a5458/81842743662.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/8390929244.pdfIn PDF document text
    • http://fygl.net/uploads/file/130702295774.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8892aea4d23749c419560299aba5eea8/bamenunegotoredodanig.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/mipakotuxonirepudibabakuw.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8603d6040b---nagumibipulipab.pdfIn PDF document text
    • https://85097781.com/upload/files/72280326334.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074437b2dc54---6479417996.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/abkgfue002q0asl2ac0rhr03jg/nuwejeri.pdfIn PDF document text
    • https://le27.fr/docs/file/fositogewafigomilutiza.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/vepuxe.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/85206279338.pdfIn PDF document text
    • http://nature-revive.org/files/file/rerakofavinagoverigozura.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/vgnuuq1j813cbnlenlasqknlh4/tazutefurikosisunezi.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/ropubibadosimemuxigog.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/gutome.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/fofalexakasuz.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/panoratavemetiwidoponoxoz.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/kumixasegodeva.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_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 17296 bytes
SHA-256: cec603226f12c393d3dca04901d849dc2c01395085163cee2fa2719b65c8eaa7
font_01_sfnt_off00011706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11706 10696 bytes
SHA-256: 68930458c427257a0a846e039bdd0050679975681b66a03224885d8e59b2fb92
font_02_sfnt_off00012f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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