Malicious PDF — malware analysis report

Static analysis result for SHA-256 1368e1fdbfc9d3eb…

MALICIOUS

PDF

85.6 KB Created: 2021-07-07 13:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41d1e696fa769af14589a0f2490573de SHA-1: 4cecc3a2a628a7de304acdff4371e1c12380d6c7 SHA-256: 1368e1fdbfc9d3ebba97d1e6e4b76e758b6c106359eeb0b30740a5040dad5809
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, indicating a phishing or trojan threat. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://home-delighted.com/user_img/files/ledupi.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/qf29sb60gn798etk5drs8q9fh1/50558743542.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2d9acfa08---27159070670.pdf
    • https://techson-cctv.com/upload/file/geguwaguburegikusabif.pdf
    • http://bukharaatlanta.com/sites/default/files/file/34619268077.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160858aaad32dc---miruzamofoneteg.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/76705656986.pdf
    • http://rrbrentacars.com/files/others/18798644981.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609c37d9b68e4---kujakemudekegafe.pdf
    • http://busanpc1.com/upload/fckeditor/file/18742447302.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d4a33c26148e63b41f3af33c82148632/gigovisazijawuzotesub.pdf
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/55157682559.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f8bbd94c93035f68f412734de8f0e14f/mosuxurufopuzun.pdf
    • https://e-uchebnici.com/img/file/87495703367.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c3440876---vowebimuvozeri.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/316u9ei5da6m6piairjhttl0p6/78005351337.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c06b7a65bd1---girumevepuwipa.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160784b9edcb26---gopiz.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/pvqbilvnlmdlees9hvmu0gsqi7/39605969909.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/jkqapo0ebtc07dg0nv8uednti4/xusudasefivofilosususer.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862f961bd55---kopuxolubega.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/cff248a3acbf077b787ded01021c11b6/80280128987.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=all+my+life+2020+full+movie+123movies
    • 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_off0000ed49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 16792 bytes
font_01_sfnt_off0001055b.bin
98ad7fa9d9c9d293feea802e0b0abb9c8817e94c12d9c672f548183e2bef089c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 16832 bytes
font_02_sfnt_off000130e4.bin
af8d4d7138126a613fca2d29ee1daecbdc818a73785b4e66907a360c6cdea03e
pdf-font-stream PDF embedded font (sfnt) at offset 0x130E4 10636 bytes