Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a8d2a66f804375…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 08:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e8fe39827e280860630a5155f24cd9f SHA-1: 1fe06806f2a83417aa12e8dfde07cd98dfee7d75 SHA-256: a3a8d2a66f80437540d7bda9071aed99a5bb839afbda2d1beced4296905e8292
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 malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the overall structure strongly suggest a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=the+meaning+of+initiated PDF link annotation
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608788e422cdb---warog.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/dedulaxawusam.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/omlrvffjlkd522vbhpqpjcvl0s/38779067895.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/junokitufifop.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/nizawifogasikebefunubake.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b748b3e1aeb---nedudajividowati.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/23478243328.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/75670878257.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/vepukagagufadukewesaw.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/bbbcc8cb426869cd8df34520ef2f5a8a/88541198144.pdfIn PDF document text
    • https://tavio.ru/files/file/77872787818.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/36664784912.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7851fbab3c5a658315c36c367fbc3129/kidijiwojeburixefepu.pdfIn PDF document text
    • http://hotechike.com/files/files/26700113850.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/53521231993.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/36ca78f65141b6b32949aaa6330540af/90030770049.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/71825401925.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab16beee5f4---2808935097.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/77fdb55f5cb5c0d0b5d093303f866981/pitubomozebuzasu.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/3249c9c81a682e7871ad4414031291bf/xotimovokamesa.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2dbed47d8---48554845496.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fbe6d4443---sugurijubu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8c7b042ca3e6db99cca0da95db880edb/12743792896.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_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 22036 bytes
SHA-256: a2983fc7758e7cb79bc60cbc5042a09b4647a460295606ab01a9e794342f8834
font_01_sfnt_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 10452 bytes
SHA-256: d71c7bb4e99d686758fe516afb019b622ad09ac51d3d88c8dcfc87e0a53d9cf9
font_02_sfnt_off00012e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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