Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65eb2ba2105bdaa…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 08:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c15222e2afb52fe8f5ba928e849d7622 SHA-1: a4e27300f056b86c873127d139358d812db6fd1c SHA-256: a65eb2ba2105bdaa06157263d9318f4da15bae2f79ae8a4494e54a9bf99808fa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. The file contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature. No scripts were extracted, but the presence of embedded URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d0b3761fa---vebisuzojidolenulotelibaw.pdf In PDF document text
    • http://schodylux.pl/userfiles/file/24940096532.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/h68nr027luavf7e8jth8s39r1i/lidatusudewoxafel.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a49bb539b53ba35eea4c5fdd10aca918/72576071890.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/49138531826.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf026a8bbb---54458021710.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/kasivoferafokomafiveb.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/49479985876.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/xavopatenonafadiwibe.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/gll45gkh17tcjlu3l6khr2pjo5/75907356643.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/wisamedinivafut.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/r12qfdnq22203b37scu9llbu03/27424192461.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a496dd0b6e---66787766338.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/16261837751433689521.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/xezap.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/bifukixuwawiganumijusarob.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/vamedetaxowibag.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf523ce627---87267711030.pdfIn PDF document text
    • http://autovoda.ru/upload/files/wunuramawosegakipixovu.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/duwaximuzonixegitipeka.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/mudalawuw.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816a6ab8004---doseziz.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864c4e72198---fexirodojileza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=2005+nissan+armada+service+manualPDF 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_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 16908 bytes
SHA-256: fa8dc945152a191f6438b79ecf68d34533fac2d37eef2778d6424469a232e1a2
font_01_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 10756 bytes
SHA-256: 8625f5d7ba7f95b3d02821c32d154eb558b7540203c8465d13d6bba4473bdd36
font_02_sfnt_off0001234e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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