Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2b149e3dfa55a3…

MALICIOUS

PDF

94.6 KB Created: 2021-07-07 01:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54744ca2a22e9c587baeb7ed04e65c25 SHA-1: bb9d88a3038e7dbc1bd31a4f6306b7fb3e7594d3 SHA-256: 9b2b149e3dfa55a387b855c053faf2105e592a834fb82b75cf9acc801099f8d5
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised CMS uploads, designed to trick users into downloading further malicious content. The presence of a 'download button' lure reinforces this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/tb6jv9g97arp863jn23suhp347/wifelujasufokewurejokul.pdf
    • http://i-dron.cz/data/file/dowoxilasokifi.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/nadiratixofimaponi.pdf
    • http://interno-kazan.ru/upload/files/xitip.pdf
    • http://aliglobshop.com/userfiles/file/bugagajarumetu.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7200d7b280---60137103155.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6cb3180a3---81100237023.pdf
    • https://bitree.ru/ckfinder/userfiles/files/72180999847.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54619013b---junukipaguzadinibojax.pdf
    • http://amexeuro.com/an3_Uploads/file/15224462617.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1f9fdd7f63086b8733d48cd8b6b85d89/veruwemisipewogunixem.pdf
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/31876082059.pdf
    • https://habibitours.com/ckfinder/userfiles/files/rujopejina.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/319ae330a6a49be025afce8401c8ad31/86672819807.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160be12a6c9135---62223733224.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c2a0421a7fd0c1570a02ade0b7c22c0f/82664939.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1i63ppah0ho13ul7ih3gqdri75/gutixo.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/986e99e1182b228fcce2f9e4f7337c1e/fabiv.pdf
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/fokiju.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/29e2c2a7b94436ede505d8efb7fca2b0/87935211782.pdf
    • http://ohdiabo.net/images/ckeditor/files/gapal.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f93eca1360---84782031689.pdf
    • http://cropscipublisher.com/files/upfiles/file/1630336815.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4fd58326dcb446dbd4e3948312529d08/8219299188.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dead+space+free+download+apk
    • 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_off0000ec72.bin
0ca8c6d793d74b5b147e2975c05b52c1e1d829283fd192538b8eb77dcb8a3cfd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 22528 bytes
font_01_sfnt_off00012414.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12414 16792 bytes
font_02_sfnt_off00013c2b.bin
d557e7285d2daf16df5d5a043f141f086e6cc17636d3d133a38524e06dc0f896
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2B 10604 bytes
font_03_sfnt_off00015490.bin
d36143056c6c02d949ae0afc7e5681c001302d02886dbbc65b6ad2e7ee24632d
pdf-font-stream PDF embedded font (sfnt) at offset 0x15490 16184 bytes