Malicious PDF — malware analysis report

Static analysis result for SHA-256 af674993c2574e2c…

MALICIOUS

PDF

90.1 KB Created: 2021-09-19 13:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5df796c088860248dcadda968791e1ca SHA-1: 9ae3ef40cdd5a3e650c6bc7de6289de83610ab40 SHA-256: af674993c2574e2c6e18a974c3e6b2cde058898af082e2ac69ed466afadf04c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are identified as compromised WordPress uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through these links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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://mavibusiness.it/file/peruwunorixofebunoper.pdf In PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/950286736.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f00d8165d1---6990295862.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/zepoxazakajigi.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/28214041514.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210907_B860DFD8286DD568.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fac4ad13b3---rekorozuga.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///11103146382.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/68250722061.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/22453138828.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/gitexogomi.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/28249836722.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/vikajigenab.pdfIn PDF document text
    • http://mobilenmr.com/files/files/90093754815.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/93169326322.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613f402e22efb---75133481739.pdfIn PDF document text
    • http://fitviewer.com/files/file/82717583418.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/557a9dae855c4697b71f5daa164d1070/tivajotodagiruwofewixijuv.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/rumatedazutuzipu.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/91663790601.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/ralixeritexaxalem.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/39943951469.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/69a81qciigj8e1qv9t27kjnht0/93091742388.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/90086114770.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/tuzuzobexurunuxaxeru.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/26qlhg7eos002vtbt2lh3sbcc8/karozedovefek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hotspot+vpn+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 20760 bytes
SHA-256: f208e0605feafb0754a1593daa1cb047a21d966eba3b519681736c6fb4e30f81
font_01_sfnt_off000115c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 10264 bytes
SHA-256: 6d6d0ca04add1efe1173f72dd748aea7dbd7fc0f20590ecb910985688fc05829
font_03_sfnt_off00014503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14503 16064 bytes
SHA-256: f76835efc0f70b52b211676925d3c3919e6952eec6cd10f320d1ab287c5fabf2

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