Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a60a697ae165cc…

MALICIOUS

PDF

100.8 KB Created: 2021-07-18 16:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4af22d77bcb4e552d147431246fafec3 SHA-1: f8d200b70b8014f0880a94d0dbac2746b0317317 SHA-256: 35a60a697ae165cc518881c05ab6023c539660a78f818937ebd3e152efa170b8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many hosted on compromised WordPress sites, supports the classification as a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c58c223f---mijumaxibilu.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9ruku7rmhuqkn2v30mvfaq1sfs/pujoteduligis.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/66087993260.pdfIn PDF document text
    • https://tempegaring.com/contents//files/15829996399.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/sebuwatezanisa.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/03b64b7686b8b2386d724aef1166d160/zolekiraxodubifujojab.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/nojominaxolidakojexow.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2805c80f06---pipul.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/1e9641789db0dd85efb73b346bf72f05/kujijube.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/20113849881.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa698bf56---27067665112.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da2a0eb2c41---15732653431.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ab4c7a548---fofufena.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8fb2b173a3c8d4b1287709b95eaaeffb/nurajezoxodunubegoxipif.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/ranofimijodijef.pdfIn PDF document text
    • https://etadelloro.it/images/file/52924342485.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a98cab34749---tepawemozamikarezab.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/71098782703.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/wimegexumid.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608572b27ed48---62681714100.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210604142423.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/rakukijisak.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lk1t3ptt8094m3hs3ajvdnq11o/bukolifuvariwipav.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/8f0cf5fe21b83301c8665e59b29e2a20/sifumopupatob.pdfIn PDF document text
    • http://poorclarescork.ie/images/17246959375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=east+west+symphonic+orchestra+freePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 10884 bytes
SHA-256: 178b4cca796bf526337d3145a2a74bce82ef06884caaab74e1821f9a9d4bb223
font_01_sfnt_off00013e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0B 18300 bytes
SHA-256: 84c6a9ca8db7b680692755edba53d473a7af50ad308b465c09c63f6ca3c37be3
font_02_sfnt_off00016dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1