Malicious PDF — malware analysis report

Static analysis result for SHA-256 883f830f52a523a1…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 04:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18056f99fc9cf4cd7f9db497140de8e4 SHA-1: 0054d236265b451dcb5eb49b2e5e7e5faaa27176 SHA-256: 883f830f52a523a1920065d3307d35d0efda2e8f99cf574760bd3acc52773a76
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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://anandamsanyal.com/userfiles/file/xavivizifodililokufuzi.pdf In PDF document text
    • https://digitaldaya.com/imagenes/file/86760338964.pdfIn PDF document text
    • https://belloverde.net/emailer/file/64721678110.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/sikokewa.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/sokepuwexitozese.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ti0gfoa2cspi55cdf5ejqtsnu2/gekovijinutodi.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/bujemulanezusatimapet.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/fuxufiko.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/jadixopoxasaxixaba.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/47778456058.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/zagisutolimubito.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/vefoxevowufixekilopalobo.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/jekujibavadisakaf.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/50371039416.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160719eeb266c9---fokirek.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/261d9dad32ae61567ef3f8e504c37f62/84775900745.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ca1d0cfee---wamut.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/pakejosepipedexike.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/wukanojuxuver.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/64348239154.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddba6a87738---70439593924.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/pj7slj76klmrru6utge9qj06s1/73773779422.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7855efccb2093d1c914c01d51cfd9ce0/18211172596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=isotopes+of+the+same+element+havePDF 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_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 10448 bytes
SHA-256: 020152fe552fc5529dff0448b0933cbeb69484eb0e41b268133629678d15f043
font_01_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 17684 bytes
SHA-256: 208b954ca230213cff41feb4c7b4906b269c2e71853e8b1305d229c98b4944ed
font_02_sfnt_off000137ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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