Malicious PDF — malware analysis report

Static analysis result for SHA-256 10930513c555393b…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 10:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a91051e0dc745f95a735e7e10518f5e1 SHA-1: 2889386449f62948e3ae25fb5b8b856c90856db3 SHA-256: 10930513c555393be5f1e188d4daadde8be83ab1f668a0e6c2120d7e24e512aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities or social engineering to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://laborke.ru/uplcv?utm_term=kaskus+android+app PDF link annotation
    • https://at-studio.tw/app/webroot/userfiles/files/20210924_145312.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/76148424402.pdfIn PDF document text
    • http://fkhd.cz/data/img/gigezoduto.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/86248170484.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/fce22e9e8e50f1c1f57e5cca47d06d88/62576127716.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db30879b50---22609797412.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/82932362926.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/denepozefovejis.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/10580145685.pdfIn PDF document text
    • http://teraval.cz/res/file/52505855543.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/deteterafarisilos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f0122cd3b---5038669591.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/48999155985.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/mejase.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614baabbc5610---68005901298.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/12160681360.pdfIn PDF document text
    • http://hbaoge.com/upload/files/30298423808.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/61257595675.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/bofuvezodarixelisibomipor.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/mijulugitome.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1cee7599d---43245627030.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/75455160178.pdfIn PDF document text
    • http://belean.pl/userfiles/file/66739624163.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7523639514252c059a18236cef0e6aa2/jezewa.pdfIn PDF document text
    • http://www.polni.si/Images/files/bemudeg.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/89335246676.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_off0000b226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 15016 bytes
SHA-256: 866de9411257c0793531c0274007f14ccf65a4418492cff138317df403b43cb2
font_01_sfnt_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 10292 bytes
SHA-256: 625b6dd50484893874e6fc401b197382ea9e603ac32d515d08f14c5cb7ee1486
font_02_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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