Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc76ffb7c4789d1a…

MALICIOUS

PDF

88.7 KB Created: 2021-09-17 02:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad443906f761277c2dbed4972c7cb689 SHA-1: 2a9430aaa9a289a5bfd4b56876194adf1be901fc SHA-256: cc76ffb7c4789d1a59ccd5ef6a1bca87554b7b0b68c5ce24cef8f749a7a0abe1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://allytemp.ru/uplcv?utm_term=how+to+download+voicemails+android PDF link annotation
    • http://opuspointpartners.com/ckfinder/userfiles/files/belaz.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413d8cf0ebc---xivotesulinufuxer.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210913_1CA8DE767D0C9E61.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/nigifufexujafazevisime.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/befumo.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/siwojufisekidaved.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161436789c9ca3---22275383253.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e1263cd0b---12290137387.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/18814606564.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/bawiponimupabulejagofov.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/38022505445.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/masaropexugutilemapuja.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///polojaruke.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/dipem.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8286eb9be---lotupuloluwuzo.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/43249985335.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/56207977066.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/taminuwebo.pdfIn PDF document text
    • http://nemochem.cn/upload/files/50686735862.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16140382cd4f39---48059154140.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614005dc067c1---17747409528.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/lewepatojekuvogosizifadi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/48e36c01d166da5d42c2f3221bb26372/53865930258.pdfIn PDF document text
    • https://henuopack.com/d/files/befojarivi.pdfIn PDF document text
    • https://kvzriu.org/images/file/8602767602.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/89865512637.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_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 10672 bytes
SHA-256: b2bcc595b2e8b207414ca8ed9bc6bd5d0d225e60226d3c88b1b03ec563ae5f92
font_01_sfnt_off000110a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B9 17084 bytes
SHA-256: f3a05f555f2ca93c02c578a11ff97a1456ee8be12de4fb44615d6005a34cd3cd

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