Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b2244a51722a73…

MALICIOUS

PDF

73.5 KB Created: 2021-09-04 04:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 88533ca1965fe3896e9a4804f56adb66 SHA-1: 5c20b3ac889b1a0d6305658f01ff95e0cf50353f SHA-256: c2b2244a51722a73554551f6566744eb64ca075a58ba075f0bc72eaf8eb8c16b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://summithigh75.com/clients/867147/File/91702296591.pdf In PDF document text
    • http://photopuzzle.net/userData/board/file/fuxalarusibixudezek.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/67590792506.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/28376960837.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/26751354047.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eaa776ff2---52562709479.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/63020034471.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/kuwigerututogo.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/1450866863.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/916aabb3a7e1b4ccd91dd063b28c5526/57271142380.pdfIn PDF document text
    • http://chira-med.pl/pliki/56106460250.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/gexizudunov.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10081d9864---13843898935.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/30c97ecb6653408b07a0d387b6e7c337/pizobixafil.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3fd6be8e8---41918285393.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/91604928489.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/51681336273.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/77663758274.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe6ae45ddf---rabezu.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/frn209q31ijvqa6qmd21i0ktc6/mekomenejefanasunetuzag.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/7068623221.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/75662382046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=define+management+information+system+pdfPDF 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_off0000c0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EE 10908 bytes
SHA-256: a338b47f1da0afafefad0f808d0dc85d01abb1b2f2b22ad95bfff18c50d907ec
font_01_sfnt_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 15288 bytes
SHA-256: 71953644057333da52e8b961f64eb04debddcbcac2af881947b4f2396ffbd04d
font_02_sfnt_off0001000a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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