Malicious PDF — malware analysis report

Static analysis result for SHA-256 e619e4b2587acd83…

MALICIOUS

PDF

91.8 KB Created: 2021-08-09 04:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a34f0264b46d1b3fed8707ad9348573 SHA-1: 6068970cdc98512abe1e5494df8881515e581114 SHA-256: e619e4b2587acd8305e02424067dadca7bb07022a9dba1d8e46ad3f3257d4449
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a link farm on disposable hosting and the use of UTM parameters further support a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 9

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=charging+ps4+controller+with+android+charger
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082deb778726---lojipuzafejuxu.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/84686161698.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/14a8c26d95e7d91d454deae8e9fc84a4/43061064186.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4b1fa8a1170e78057b7ea92235081678/borutututudunuvisege.pdf
    • http://tomei4x4.jp/js/upload/files/76374528635.pdf
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/33593444464.pdf
    • https://amatnieks.com/pictures/image/68582229028.pdf
    • http://watsonwilliamsreunion.com/clients/82103/File/fanirerofonifusiromera.pdf
    • http://blesk-stroy.ru/userfiles/files/26963367200.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/84f6afc87544d942386d7e4c1e906029/rilufigekup.pdf
    • https://10glazsikeyrosa.ru/file/21769774825.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3be2b8ecd9b2e2d2d3ad0498d3ebb6bd/bezeb.pdf
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/wofuwabiselopemapalediva.pdf
    • http://aitrans.cn/UploadFile/file/F1202106171106109123.pdf
    • http://galantemontagnana.it/ckfinder/userfiles/files/gamefura.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1a4b5b9fb4092bae2eaee6f76a88ec97/bavakevudusowusixixanuk.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbeca75744---rikozuvuvisatid.pdf
    • http://erex.hu/upload/file/15349418949.pdf
    • http://haciogullari.com/depo/sayfaresim/file/1665080031.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607567b3eec73---logegodosewuturexi.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6b529595e---mifijovojaxezen.pdf
    • https://chsins.tw/uploads//files/202108071723563855.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c03691c7af8---molexixep.pdf
    • https://aduanaldelvalle.com/userfiles/file/72357408973.pdf
    • http://creative-format.com/upload/editor/files/jibefokijofavero.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ef.bin
a2d73d19c5962cde49b6de14e91cf1b53393a86dff01e64b32cff60fa06558a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 17516 bytes
font_01_sfnt_off000126a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126A3 16792 bytes
font_02_sfnt_off00013eba.bin
5897999d4ec57af5154a24484ec431b45e534f397680838893fdb4f8169201bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBA 10988 bytes
font_03_sfnt_off0001581b.bin
5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1581B 1732 bytes

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