Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53c189402a7df6a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 13:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8e8dcf1d1a3977265e6524c04e8511a SHA-1: 0a92e78135d97c3233f581c92e66f71a2e81340a SHA-256: e53c189402a7df6aac026c02701d8ecadca4e72a9c27107f71d147d66df77e12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple PDF link farm heuristics points to a common tactic for driving traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=infecciones+urinarias+en+embarazo+pdf PDF link annotation
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/jikiwokumubolujadava.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zinukizi.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/n5ndgtuf6r2migq4ddbgkors9o/44812207986.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/7r0qupm85ts9fj4770838faov7/bukurisu.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/808898db37c0640d3846d9cec43711f0/48989107470.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cccae4918c76f4d18db1f98a67c56043/wosixik.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bb628c1aba90f7816076cf43e73ee923/42757834852.pdfIn PDF document text
    • http://rld-carbon.ru/file/wazimajutowupox.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/n1hq0m65qngs4jk2tkijh2ukas/95843113318.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607818de14bd6---79355442417.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210705135343676878hl3t06yaaig3.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/8760592843.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/xugimoleluke.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078a8fe5c2c4---72951046225.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/20/72574217164.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/daf770b2d8d065dc1011be567d71f7ac/28928532149.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/27070944276.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/lenapuguseminasanabone.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa2fbf8f4---folubefowepudewajoverogo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8870de72d1f3955cdbbcf64d649147f9/41835818942.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/zivujej.pdfIn PDF document text
    • http://askort.pl/Upload/file/jasivusati.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f8682ea3358---61176435845.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/sinadusabipad.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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 18144 bytes
SHA-256: df65f8862c5f6e8e255341d6dd582a7c330012b0d3a533675183fc8974283e50
font_01_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 10888 bytes
SHA-256: 060bcb8df3f0b8b72320f3e1c56946fa94e625f550b0c005aa4de06847b4bdc5
font_02_sfnt_off00011de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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