Malicious PDF — malware analysis report

Static analysis result for SHA-256 2135863627ec9c20…

MALICIOUS

PDF

95.3 KB Created: 2021-07-17 08:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3936fc4ec13538735b22d2952cbd64f SHA-1: d85041661201b4ebecb489f0179a38ac282702c6 SHA-256: 2135863627ec9c20d91373d39ff0d6ff1f498b11cee123812a37430ce7c54c45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fresh-cherries.com/ckfinder/userfiles/files/31059432889.pdf In PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5d00ba29163c5e2d866e70cc9d216176/544610784.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/warudidesisox.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b79fcfb1b3f3c5250a8efc251919c8ad/vilevulukas.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/5b89f067de50e6b925f35ac9d3e3579a/bosonugavonatamejip.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd85733e2c---vuloti.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/joxasagaku.pdfIn PDF document text
    • http://esistore.be/userfiles/file/donoredejukilesutibig.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160947af518ee8---64156941260.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/56194219180.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/429k2c60ufq439qskpmmdanlhj/poxesiva.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/roturesizaje.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/rebijaposinezoziforoju.pdfIn PDF document text
    • https://menu2uplus.com/images/file/78394337319.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/zejuwuwi.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/49215154484.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/14252223658.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/25156235105.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/08d6cc5a1d89dfeac0e10e29868ca389/sinipazufexuvojiboju.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e5a4b455---disopazujipimiwavu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609affe9d23c8---74412950706.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/48d044da1ae040e9b647f179b3d8e2d2/73102073756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=put+on+the+whole+armor+of+god+nivPDF 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_off000112d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D3 10884 bytes
SHA-256: cbad75ea8acf52aa1f77ba75f52f21fa2f388ad7be7cd916c02c49aaad0105fc
font_01_sfnt_off00012ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA1 16984 bytes
SHA-256: 997a7a446d829999d01ce682927b8b38f37dc6023bf09da1198c721a8d34053f
font_02_sfnt_off000157d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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