Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e317107a0b4aef…

MALICIOUS

PDF

88.4 KB Created: 2021-07-19 10:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ac2763b3c2af47a3375e3db8a5175d1a SHA-1: 0205f9291b9354db570e4a2fc8e82507a343cd77 SHA-256: 99e317107a0b4aefc8948b15d2906b69313aa90fbab09b0efeee1bf2128da6e4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary purpose appears to be redirecting users to potentially malicious content, leveraging compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf26b46fd8---xazovokusesomenigaxorixe.pdf In PDF document text
    • http://remont-elektro.eu/archiv/file/zamepubade.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/42160419010.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160974477e43fb---65905698069.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/64123653529.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/pikupubad.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/ugpbdqo75e3e8h89j4dp9vimdv/84364659630.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08bd66cda1---tagofavutividunapo.pdfIn PDF document text
    • https://abeess.com/userfiles/file/74617440334.pdfIn PDF document text
    • http://atek-ent.com/upload/file/35605178687.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a533f722b8---3473974859.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f6c75d50---kepodomanerilog.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/berijumabudavekaviw.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d2e8af763---fenev.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/vavotalezogajuvesa.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/23891631448.pdfIn PDF document text
    • http://teplospectr.ru/images/files/bopagaxotagovuba.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/muparebilezenawelagav.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/94291516623.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/43191422243.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/69289578552.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/tukufizokeresiwadaputenej.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e08f452313c---vifelate.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/zojenujonasumi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jeduxajonejo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f6add8676---90554046648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=diet+food+chart+for+weight+loss+for+femalePDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/bapalumivematuj.pdfIn PDF document text
    • https://medlineplus.gov/diets.htmlIn 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_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 16928 bytes
SHA-256: 017490477e05eee1948eb17fa9cd1d041c4bbe97ec2570a70b3d1f687c639543
font_01_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 10908 bytes
SHA-256: deadc9cae1da153e33ead87cfbd7841007f83e2fd4a1a4c33be78b699413a361
font_02_sfnt_off00013c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1