Malicious PDF — malware analysis report

Static analysis result for SHA-256 d874d48133903f4b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 10:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3b5223749273c697c507f84e1bc3688a SHA-1: 5f2d36e1ddaf424a1b6ac28a64ed884fdb082006 SHA-256: d874d48133903f4bf666e87bf2af78bc5a009c0ff77396f6b5f5826d2863d7e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://phsclassof1970.com/clients/875774/File/90835482437.pdf In PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/193j4hc0v4k13ndsu9jm89d9jc/20035024825.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/fiwomuf.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/50001915555.pdfIn PDF document text
    • http://spakimthi.com/upload/files/galadelugelitinuzadogu.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/jezugovepususovisalileli.pdfIn PDF document text
    • http://aven.su/userfiles/file/banefijagogasoji.pdfIn PDF document text
    • https://mfdesign.hu/files/file/gotizupetowu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fbb04f7ed---52535507861.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160853d1e5f840---ramibol.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e9c4372c5758a772dd8a2fa51a4be8ce/43105765524.pdfIn PDF document text
    • http://alvitraders.com/files/fexozixele.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/webigorixogafababevukib.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/57620930244.pdfIn PDF document text
    • https://badrivishal.com/media/47211093025.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/rosuziwetoxusi.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e972d3679198b224e5b0dfe558fffb54/33331920489.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/jjkb8o39pe858bcb149tbq4se0/wonulekogegegesifedadaj.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/52483686660.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/10803833691.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/23592161647.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091c212de3d1---fefewedox.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/ffff82c8462e499a611031a0bfde0701/65950443250.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/96550381008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=differentiation+using+product+rule+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00012ce6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12CE6 18360 bytes
SHA-256: fe6a030cce3a1e6f7bc0bd98ffaf71e5932d07356b5efb165c677cd9129ebadd
font_00_sfnt_off0000cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 10896 bytes
SHA-256: 0799464693e12cf7d4ba9196965553f488def2e4aef50085ce5613599c435d55
font_01_sfnt_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 19252 bytes
SHA-256: 93c8bbac0fe5477f5a2ccda75b6d802b3ced36c1fc22e2759b61fa4bddf05736
font_02_sfnt_off000114d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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