Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98deb52c19f13df…

MALICIOUS

PDF

68.8 KB Created: 2021-09-10 10:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7c7ae84744ef8974aa120292e26d56a SHA-1: 8193919f6a5ad99cf1481e001e1ce39e954bb561 SHA-256: e98deb52c19f13dfa17c31d76fdd0b33fda8a4471872e5729c3c461d8307715a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/cc24nse8celm02llm2q8b18jr2/tomodixubolezabawexiz.pdf In PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/zekamazetediredu.pdfIn PDF document text
    • http://superazs.ru/images/news/file/sekotatogusajifoxuto.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109070136158802.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613759672ae24---fojawevubibal.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/71391046949.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139409d2b76e---nobakaxis.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/vawane.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/30220108661.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/39022896800.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/povut.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/gemajifadadusitufigede.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/96256984309.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161326752ad62f---bosapoludodewuwira.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/56211683631.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac88450a82---7722069694.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/23717f143a80aff4f34a47835b65ed83/bukoro.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/dilixev.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/48814006675.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/kisufogexe.pdfIn PDF document text
    • http://linker-apps.com/files/koxalawubemofukefoge.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/nekaparonanajuzikofaxaka.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79930750119.pdfIn PDF document text
    • http://becucci.it/userfiles/files/poxizinigomivud.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613a84cb6d070---buwemaguguvepozebijenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=zombie+diary+3+mod+apkPDF 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_off0000b11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11F 10616 bytes
SHA-256: a4e15c2eafcf72b7c736371c8cc56ad3193b672be83994b8c8dcc7cac30a5a3f
font_01_sfnt_off0000c937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 14296 bytes
SHA-256: 481750eb106922fa65b7aef73aba30488a5d366d3d8621659c7a440ea99b251a
font_02_sfnt_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1