Malicious PDF — malware analysis report

Static analysis result for SHA-256 e193dafcd81f595f…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 16:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0e28416cc1bc3b76d4663b87b3f290e SHA-1: 6a9b9204b6560ad868e62d05e68186b116a154cc SHA-256: e193dafcd81f595fc4586572b3422c37a72e7c076ce066f4e9f809d7a0f180c4
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a link farm on compromised CMS upload storage indicates an attempt to disguise malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://thehouseproduction.net/file/kakigozonuwuligefa.pdf In PDF document text
    • http://ge-mak.com/files/sumatakotibobebuvorodar.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/d0fvg2jp7qrjs7nvlvlnlq3np5/kowirewewe.pdfIn PDF document text
    • http://519pf.com/userfiles/files/17495772199.pdfIn PDF document text
    • http://koala-al.com/d/files/zotivuvidujugugesirot.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/70384081171.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/vugubowowekuv.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/59027980531.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/zafuvilovewusawogeti.pdfIn PDF document text
    • http://silver1979.com/upload/file/66942728995.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/runonilixokiga.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/zovenozakedanodekug.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/kowazipomusulegotonovir.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/49062956906.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/wogunesup.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/28143269740.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/zoxusew.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/868c9affce78bdbe3c3cf2d7c0815a58/49729870306.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7827ab13---55746379105.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/gebusopadixefakiji.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/4051624276.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/gelusopa.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/gukorixopa.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/zavapudirazaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=game+upin+ipin+simulatorPDF 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_off0000b230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB230 15412 bytes
SHA-256: 2520e919b652c8d28c1a659eedb59ab8e3d55bfe07100ab949e330dbb905c13b
font_01_sfnt_off0000d8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 10552 bytes
SHA-256: 8c8bf7f5a7cd40e5358736c3312fb68b4e3b3fc8e2675407fce669e557032136
font_02_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1