Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8efe92669b35af…

MALICIOUS

PDF

92.0 KB Created: 2021-09-06 15:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fedd05c9c7384cfaac9487f686889db4 SHA-1: 0947a0bbe57a468f6b8c21170f9ed1c5ddb0f1ba SHA-256: 3d8efe92669b35af2a9471c15a13524a061180eae65c5ea1d298f186c932b11e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to direct users to phishing or malware distribution pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=poezii+esenin+pdf PDF link annotation
    • http://hotelniagararimini.eu/userfiles/files/33834459451.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b55f7a82b94---60930439361.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20716663314.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/vixoliwana.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/wavabok.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/nobabinatodokesuzibobe.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/faliw.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2a9c46d5---94305422585.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/warovanamabanu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48345a2115---losajebuwesedepij.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/70429748486.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nakatijiri.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/3c2g6n755lg6t99jgpclqqqvt0/vivevujabo.pdfIn PDF document text
    • http://abnicum.com/files/file/53410826108.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607938521c357---54787995323.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaf8dbefa3---97566110578.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e359b0ea5d54cf6245543ee16fc9709d/39139270578.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/sipafozezudov.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/77128687932.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/wivoxesu.pdfIn PDF document text
    • http://domosplast.hu/files/file/2846259458.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612837a35f6f4---ranejudejanaromeratamovi.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_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 10148 bytes
SHA-256: 8d3b81dbd9312e2bca62b254c38fca2c435916bcedc8ce52cec44db2ecb0c367
font_01_sfnt_off00011ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA7 18908 bytes
SHA-256: 3e3188dd667b32b7a4a334cdba1d0c16bd272d7e298be642f2d87d0525d90d1d
font_02_sfnt_off00014a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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