Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca740ac225806da5…

MALICIOUS

PDF

90.7 KB Created: 2021-07-19 15:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc0abdb192f30981a386ae46daae1929 SHA-1: eebbc4120e94a4b66c78195723d9495b0af910dd SHA-256: ca740ac225806da521fca9eaaf3a97d5769b63e412c1a2decaf07e052a5a6bd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://elnativocoffee.com/silver/upload/files/nawutos.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bada5ecc907---33688767959.pdf
    • https://netshopnepal.com/userfiles/file/40090953971.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e4a38e309---87200924325.pdf
    • https://tecnicamistasnc.it/file/tijubef.pdf
    • http://www.radiooro.com.mx/media/images/uploads/files/gejilapejokim.pdf
    • https://girl0229960192.com/upload/users/files/19295712525.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/624f476ee5695119a821a75ba7dccfe9/28179814647.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/galeritigasurezo.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085be02705b9---1884442529.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/kiwivisovalubemone.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1150c646bcc4b17356666242d6b2e9d4/97627444162.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609046eaf1621---poxojumose.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0d3cjoutnecqeuc3t9tbutn83/rolerewinidexo.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/jutiputerijodipo.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97569b55b1---59427636902.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6ca61699f92a5d7819d0803efa3be100/14817019908.pdf
    • http://portalcom-b2b.es/img/user///file/_0514502001621526495.pdf
    • https://sukaunited4d.vip/contents//files/91334220781.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818128a0d8c---81412122221.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7e4a97d1e1b84f58c8748a5b5e71e98e/56881262827.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946b5c74b5d---77050341299.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mighty+quest+for+epic+loot+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd0f.bin
c5fa6a51d63eb9c01cb9eb3586de2c10cdaac0793f5a278f5dd5fc4e54f8aff9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 17756 bytes
font_01_sfnt_off00012bd8.bin
efa52baadf7e27ed93c45612be6408db8835aa78603b63a48d6f07019734d4b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 11100 bytes
font_02_sfnt_off000145a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x145A3 16792 bytes