Malicious PDF — malware analysis report

Static analysis result for SHA-256 34da919f12b50f55…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 05:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d53433f1084f7f812ce96684071a29e SHA-1: b3c9ad564e09e30af4d671ad810aa8815a94046e SHA-256: 34da919f12b50f55988313dc42bb21baf847d096d2e1caa4a03f1c5ee97a435b
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier strongly indicated maliciousness. The presence of multiple links to potentially malicious PDF files suggests a campaign to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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://ecohort.com/userfiles/files/dawemiruvo.pdf In PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1040e4fd929371108c8113d61e38942b/82323142452.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/wosisuwezi.pdfIn PDF document text
    • https://norservis.com/files/files/12840170879.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4b290ace2---50376387512.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb70203ca---waxujoruj.pdfIn PDF document text
    • https://sambelteri.com/contents/files/bekinidasutigikebapifup.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/41914609056.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/45718837626.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007a2c046b---xakebibapiwutazelodebez.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/93852183115.pdfIn PDF document text
    • http://stisk.com/file/65081519294.pdfIn PDF document text
    • https://marosme.ro/hirek/file/63379513208.pdfIn PDF document text
    • http://autokaryszczecin.pl/userfiles/file/ladigojuzapejoruzibita.pdfIn PDF document text
    • http://gibisch.com/files/files/kituwiludilojufabowipive.pdfIn PDF document text
    • http://surestegc.org/documentos/file/72060462269.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab698f83b---94002673204.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/bafajezosa.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/16548950152.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7813601383.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/52588191507.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/retot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=locker+code+nba+2k20+mycareerPDF 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_off0000ae18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62F 10672 bytes
SHA-256: b1a13b2d40438b96e194935671e682a64f1cab8ae3b434df10620cf43611b05f
font_02_sfnt_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 14848 bytes
SHA-256: e26699e037bc9d6c53621c6ea54f8b5a1c86a63d216c559e024b3ed1dac9fe19