Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f6089144d5ddbf…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 20:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7755036bc41ee0cc9254a014bb7e46c SHA-1: 68fd40ca5fbca0043b5a59a51360b5b752fd4bc6 SHA-256: f5f6089144d5ddbfa4f6febce6683bee1b4acce83559c0712725dcaa31f46426
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting, likely to distribute phishing or malware. The embedded URLs, such as 'http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161319329b16b7---gajewudejifanukuna.pdf', are part of this distribution network, disguised under lures like game downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://findmealocalpainter.com/insurazon/admin/userfiles/file/82079697372.pdf In PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9cbe3c9d98dc7578d549bb2de51f52a0/54772193617.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/wikonijonixul.pdfIn PDF document text
    • https://virker-ikke.dk/files/toxorefe.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/ginudosivumixisox.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/19364014694.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/natunevitimik.pdfIn PDF document text
    • http://landpas.pl/upload/file/sukonik.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/sidefipezanuj.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/43297208082.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bdc987a18---7443981835.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/31179118061.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7cdc5fd7f---sifibosubuzukasimer.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161319329b16b7---gajewudejifanukuna.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210903_8D82D1AC1B19726F.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/5974821356.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/29985904708.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161384ee48e21e---wajiwuvoraf.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1eee089275f5e8765f0babc081ca45c2/79509120514.pdfIn PDF document text
    • http://airfa.it/userfiles/file/lulilezekurumozazama.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/rigosajilozejinuzekisoj.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/56175801848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=garena+free+fire+booyah+day+download+for+androidPDF 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_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 17652 bytes
SHA-256: 700f77d6d35be6dc31746416ef16a29f9e530b1d31dc13d3033704307e4d15de
font_01_sfnt_off000108ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 10564 bytes
SHA-256: c9038ab30f44856d21ef75b71bc4e527786197b985483809a0b35aa3e46c149d
font_02_sfnt_off000120f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.