Malicious PDF — malware analysis report

Static analysis result for SHA-256 5addeaa9449698d1…

MALICIOUS

PDF

89.1 KB Created: 2021-09-05 10:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d85d48af8a486554ac07d51d33c44108 SHA-1: 3b36bbf319b0caaca99af1ff71544ee029b1d0aa SHA-256: 5addeaa9449698d158cf314729096cd9c324812fa75604e019188d5c3f588ee2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination and potentially distribute phishing or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://gymostrov.org/gymostrov/userfiles/file/29991306139.pdf In PDF document text
    • http://devison-matras.com/upload/file/gutamexativ.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02e8b03ff---tarotaroz.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/feruda.pdfIn PDF document text
    • http://zaiger.ru/img/file/zaporasokegav.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/xigotamovizuvibe.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/13252484357.pdfIn PDF document text
    • https://bloomeng.com/uploads/89478200104.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160746373b1916---49691448459.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/71147711186.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/zezezosa.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7b678ee3502c0bf284386a94ac2d9385/65778060349.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/jatopebiwozov.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8866e9814---49280070952.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36412326325.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/libopep.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/9e148e7522c12f8b605088a85ef44b94/noxewojakex.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/jujetuvibo.pdfIn PDF document text
    • https://maisonforville.be/documents/file/jakavikowurikogivexezan.pdfIn PDF document text
    • https://unaizahic.com/Files/files/wulowalipawalan.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/bq8pdo66anm9hi2u8q8c5gq802/woziborezab.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/nvk8t38vh1g59f6pr7ogop79s8/80430725712.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ruopuil6i7cu9f74i1rsiaaqpo/xufabafuxonusulavomeged.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/gasimulev.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/71181018177.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d802273c0655bbbc342dc1fac8b8f0bd/53877786140.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/42992009624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=qualities+of+a+good+research+instrument+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_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 18552 bytes
SHA-256: 1ceafadfb03671c57466d89e2b789dd1b31b78e6ae6e93e2148132edcef68bc3
font_02_sfnt_off00013c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C61 11228 bytes
SHA-256: 1b654e60a3544e40f20b32717e692ffe3bb99ec6438601e172dee348ec041bc9

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