Malicious PDF — malware analysis report

Static analysis result for SHA-256 95626329ffd88989…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 16:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dae625348817453eb2ed972c731ec023 SHA-1: 99b8a2fe32823998a70b0f6bb1f77ea02a273d44 SHA-256: 95626329ffd88989b55d15f51efb6f03fb88e863ca6b60b3776d05da58f5a6b2
156 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 uploads or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rotarybrescello.it/userfiles/files/22623135101.pdf In PDF document text
    • http://beiwendq.com/userfiles/file/gevawilufizelofovod.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/towawoxoxid.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/49589771498.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/wugonozinepotevimu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n2eu74hv90s95vgcfgpg9fbf74/98901564101.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/74260666208.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/60450894451.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f7b01c280---mugisusikomolisatol.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9mhacsdkh2vih0p0ef8p1piv6u/fekewajizazirope.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/50550588307.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8fe6f99d---wupexivibezozibow.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/86283380369.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c00bfdc06b---reratitojekokani.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j6n3onsca1l33vf6oj4rtcsu12/26096387482.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d14aba89---gelonawajapopolodegag.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/0fb07eea5f5099d58afcc527a62fd189/gupipigu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2f120ef595dcbd9f0e9acf2a962dbcc3/52564224597.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/jumeluwomitu.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/kozexi.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/88812304400.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d91ff1889---nuzexagalun.pdfIn PDF document text
    • https://advik.net/userfiles/file/52862745618.pdfIn PDF document text
    • http://hotechike.com/files/files/41823346197.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/92507575916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=andhra+bank+deposit+slip+download+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_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 10892 bytes
SHA-256: 5d5c6f1caade0216fe79e9dbcf4e0c918454f021a911a9291c410b45c32249b4
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 17288 bytes
SHA-256: 0cd8ab9baecd608b1749e0cf1c55ee1dac1b61cc31c1b4bcba12627d3a526bc4
font_02_sfnt_off00011fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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