Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a513de1f2d2edae…

MALICIOUS

PDF

86.8 KB Created: 2021-09-11 01:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 054370c4684ddcc0dfd2668dc3469f36 SHA-1: d95bf96db42fb4bcf460683e9f5f98c0261f6f6b SHA-256: 2a513de1f2d2edae4c53e90a8bec48dbd8c29089b8003430074c5aa9e5fd869c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also exhibits characteristics of a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=ps+2+games+iso PDF link annotation
    • https://rumputhijau.com/contents/files/14442806797.pdfIn PDF document text
    • http://keacg.com/upload/files/kurunoruk.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/liwiral.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163054192996043067139.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/89120529531.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/walipesimobu.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/fufazejelajunasewuz.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/midimapovasofibe.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/pafebexabatigovik.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613815254685d---sanelunukimunemute.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/wagofupenobagufozul.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/72946618057.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/54323629707.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/95832505658.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210904034942.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/pulatidigebaxuzexaxiw.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/119477af2eb00e1d022fbaed1c743ed4/55817006475.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/budemuwabe.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/bawekubenobegave.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/83688405582.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/pozulixagaxegexoxotagaz.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff965e6b90---repufejeja.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/kunax.pdfIn PDF document text
    • http://grotech.in/userfiles/file/jafujinagozawebufoxi.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/bijanijetukanedoluwede.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0019882eb---pebiragafijekufivatetiriv.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/48562880180.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_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 10224 bytes
SHA-256: dad07721afd995b8c3f11e795bb2ce019eba2a6b281c2da8e0e1ca589885479e
font_02_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 17520 bytes
SHA-256: f382c826ccfa90092aea67dbffda54c395e7d7de5494b4ddb8499cd3ffed77d5

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