Malicious PDF — malware analysis report

Static analysis result for SHA-256 5703609336c7ce31…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 10:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f907d828c7c20297e5a6c52aff81add SHA-1: 55fd4bcfeabd7ab9e554886a2426d2e8a3b79df1 SHA-256: 5703609336c7ce31645f5c65cb6b30841330faea5d18c27c77284001eabe9e7d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=lupus+and+heart PDF link annotation
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/latopikiraduxuvum.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dae75ee0bca---xotafofozunaj.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021621192361845.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fd6d9fddb---sizapuvabisi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5007eed64---43587099133.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/60885230158.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b781b74f8381729c42a6e95269518409/98922583117.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/21061695516.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/40880773435.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/62g3s9tlug9rbm76b5aaibe4f2/wakavafejavozanafeka.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/122301308360d71eb4a123b.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/somafi.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/vuim1pthjghn0epkjld0i19s93/26515628797.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/wojororibomu.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/luvoxupoxunefikafovoma.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/88c9b100d499ede7e62785911dc79df8/4222000774.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161276793c53d7---22924353436.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7bd658d60---98897185363.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/dukidituri.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/xomower.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb7f076f9d---wekuzefa.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/8bcdec83651bb1e0ecfd047602c57720/pugakumulemuruni.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/98798465624.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_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 17348 bytes
SHA-256: b7c2913ec0e083a1b7b9b989ef0ba2b0142497b6825252c7409f175d7c1fd5a9
font_02_sfnt_off00012fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEC 10288 bytes
SHA-256: ee9ff4cd5f5aec34895bf177bae4c2aa4e39fd9e06dcaf13acbd7380f88e6fc5

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