Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbb58cc922c27d9…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 00:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8397de2ab6d53d43b6b59569407978df SHA-1: 2e593b903d003d18080090b0472377acc7b28e03 SHA-256: 3fbb58cc922c27d968df75e7d233dfcd8769edd01d06b271ae60b5617c9819c9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress uploads and disposable hosting sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://pixomot.ru/uplcv?utm_term=balance+meditation+android PDF link annotation
    • https://reparationmobile.net/userfiles/file/gafelelapesokabekagipifuf.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/31046563922.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/27876269598.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/tixig.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/2524243604.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/sidutujiresorekuwebunali.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/pewaje.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/dulolusofuforiretizu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65a922e0872ca5675a8724f49c5efe67/3081157025.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/vewofipiwuxaradobavevil.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/samipekuweve.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/zuzevipara.pdfIn PDF document text
    • https://cooperspick.com/files/lizujelamuli.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/51304632723.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/veluzapodubananopa.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/repogoxeruwunebup.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d10f679c8---87517504135.pdfIn PDF document text
    • http://lgassociates.in/uploads/jusunimekaveme.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/46573430232.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/15070184279.pdfIn PDF document text
    • http://bwc.lt/i/79364385268.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/62838417482.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/siguzijajaduvazolagukas.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/26305215105.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/rowaxoxomitodadigan.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/vemixusodosev.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/078c697570d965efeb64891ea1f8fc1b/59922559867.pdfIn 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_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 18500 bytes
SHA-256: c7437e9cc3dce6ef6443d9b4183b755ea2fbf1bd36fc104fc6eb523578ca757a
font_01_sfnt_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 10416 bytes
SHA-256: 41bb5f50be57898c3f9970f254fe5fdb42a37f49641503bbb0017e50a2b65b7e
font_02_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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