Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91044557a85d174…

MALICIOUS

PDF

69.5 KB Created: 2021-09-18 09:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0f060d26970c4c2d5e0af48370e8a5d SHA-1: 5e6cfab43fee087b9504b7bad1352381a2ed9e6f SHA-256: a91044557a85d174adc2abeb0214c73b38d45d49ab366a553d40ba04786d1a13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, with a specific URL suggesting a lure for 'VPN premium APK cracked'. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://memsports.com.br/admin/libs/ckeditor/ckfinder/files/33174710691.pdf
    • https://bataretak.com/img/files/file/wuwimutakirep.pdf
    • https://www.aukuras.org/ckfinder/userfiles/files/86666911279.pdf
    • http://vasekurzy.cz/userfiles/file/92366299734.pdf
    • http://dokumsuzgec.com/userfiles/files/7883279565.pdf
    • http://sanfrancescovet.com/userfiles/files/dajakanubogezoxafew.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/84024784897.pdf
    • http://creativetechno.in/userfiles/file/pobam.pdf
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/77468142838.pdf
    • http://timnhanhonline.vn/upload/files/rujuxoxulifivuvubavo.pdf
    • http://builderall.info/userfiles/file/zupoto.pdf
    • https://citytrafik.nu/images/file/tuduforijo.pdf
    • http://print-resource.co.uk/ckfinder/userfiles/files/5491173829.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/wuneguxapudanina.pdf
    • http://www.findvoters.com/userfiles/file/pavabofovonijoje.pdf
    • https://gsm.company/ckfinder/userfiles/files/wodomikaxumuxapi.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/a1f419755c676590bfd2ba06bcc3a0ee/vuvizobakisaxiwas.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/3qjam497ctv3sn5i85vgvqefu8/lodopuveditod.pdf
    • http://botosani.ro/img/uploads/file/73804068519.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/k7dba152o1auecugqqau96knid/sujipeboguxiwu.pdf
    • https://mamotato.ro/userfiles/file/bidimo.pdf
    • http://ottomaniantextile.com/userfiles/file/bolidizarefugifuxujubuzo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=vpn+premium+apk+cracked
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b280.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB280 16792 bytes
font_01_sfnt_off0000ca97.bin
e2f6eb0c0b0cac68e07e755600c342da85eefbef53ee3e411e853d2fd1135ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 10404 bytes
font_02_sfnt_off0000e212.bin
aff71c75b4eae6be8e3436c2068c628713144c21c8ca9b45a5ef6714fc0c985b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 15356 bytes

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