Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b976eb44de5ffb…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 00:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33446b7a08d2086581dabb685aa15837 SHA-1: dace65c1d9a7bfc3a31206426163e3c2fc7b39ab SHA-256: d7b976eb44de5ffb3d9f4fb4723a5a03b66bff771bc4f5fdda85efdec44249b0
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple disposable domains, a common tactic for phishing and malware distribution. Heuristics indicate the PDF is a link farm on disposable hosting and points to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites.

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 http://maximaviajes.com/FCKfiles/file/11460794147.pdf In PDF document text
    • https://contemporaryteas.in/admin/uploads/file/vodowaxegezivukogo.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/rezaxanujarivevaxi.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/bonofadefu.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/75266789805.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/xobugorum.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/fuvenakasikajoda.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/047f37a7984920d3ac3001f161ea9b32/xefixibuxusejujisu.pdfIn PDF document text
    • http://cy2hand.com/userfiles/rifopiwodevabibavuzifep.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/73154111079.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614936e6b55e1---buzaluvexosuzola.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/dotugekalidisevatazusez.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/61322753186.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/xuvimojevadilapi.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/51969086698.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/49880021119.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/sanoperusosimuxi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615564eb9f439---fifologukuxob.pdfIn PDF document text
    • http://rld-carbon.ru/file/88704690041.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/99565684227.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rs38i07s1f9ae74haqm2hjudk5/bibezuzi.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/4775153224.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/pavabofovonijoje.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca81acaf4---bozujine.pdfIn PDF document text
    • http://www.bash.cl/media/file/tevudizujifedepet.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/fibem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=game+fps+iosPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB374 10208 bytes
SHA-256: ea4c2270a3af2d2903da61e2d5351a85a39c7c00ce52e4e1f4cadb65a2b31c74
font_01_sfnt_off0000ca5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5B 15280 bytes
SHA-256: 18c9a81ea6f81a6841dcd1d9a6c8f2b3b7f7aabd11d7e40cf23eeb00153e6444
font_02_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1