Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddd4fde7cd24292…

MALICIOUS

PDF

91.2 KB Created: 2021-08-12 09:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8cf77ae4d8e30c2b7b28703e1ad460cb SHA-1: 88897fef0658dcd7f627b75b09f4c752d14dcbb4 SHA-256: 3ddd4fde7cd24292a20d2bf6be0eff9028f23f27e8d3f20a1c9efc5b3e7b0f54
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable, but the heuristic firings clearly point to a link farm designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cementfeet.com/userfiles/file/venamazojevanogi.pdf In PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/toxune.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b524fe94da9---82792872564.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/83858850005.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c429f783ff---zukanati.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/87522834830.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082af909510c---4563317656.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160770d82f10de---rugaxofutuvawaxasa.pdfIn PDF document text
    • https://buka.ru/sadm_files/dixudamezalitumeb.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6357945044---91247013656.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/19945092506.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c4473aed4120349ad33bec5e3f53729d/31065034326.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/xanulamumunofewajutajojov.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a89c3578fcb---wumiberagilufaxufurosixo.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9061b8f742a7ae3f20726130ac6836f9/vejaxozomafod.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/memitagedu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db050ca93ac---94015877455.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/dabijibufaxogufimuk.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad357e1decf---xiwatarumo.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/dugedosunasunikuloz.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/zapufuxuxemim.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/wanitipavajirugotodopades.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b24cc7dbe---78399418257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+you+connect+indy+evo+earbuds+to+each+otherPDF 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_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 10916 bytes
SHA-256: 492f4cf5cda426a0a370b1eb4b136064dfeaeba98f58f34d0bb1ed924afc55ae
font_01_sfnt_off00011742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11742 17740 bytes
SHA-256: 4aac9433f5bbfbb56c8069d408c8e4460c4b618a394eb593a4cf623a613745a7
font_02_sfnt_off000145e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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