Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1bb378013ce47a…

MALICIOUS

PDF

85.3 KB Created: 2021-06-30 23:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4728c03a4f22cba4031f874901e0dd2 SHA-1: 30bbd099cc8b96c3dbd82014eb1c7a2dd67c221d SHA-256: bb1bb378013ce47abffa481ff87ad60eda0ab72a2174b2f8a47ea4431f84aded
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=marshmallow+from+plant
    • https://sharenkon.com/files/kelepitol.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee474e269---xalofexegemodigerugi.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c7e7a9376---rabowovosojuzesux.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r5h7oben3g08thpb1ut0l6ktd8/24535547985.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/c08c9d91913d74997acf7cd668324e9a/tekezawasisarubopopala.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/f6jjpreos0qsga0khbkehbajck/xerobuji.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/328e415c7178272bac03bba9d59c541f/tepoxufogimuzulipoger.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/14162751026.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70f9715121e22269d315c7425f6dbd65/15382525875.pdf
    • http://kleinschaden.expert/userfiles/file/56684052741.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16080531aec35d---35919316270.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893d97d6e95---79899546696.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/namgll2rofs4vg77gtb57b0uo9/xikopobaduvukemoju.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90ee37a65---67364666699.pdf
    • https://fid-data.fr/app/webroot/uploaderfiles/29185384483.pdf
    • https://anukulagrotech.com/userfiles/file/zabasenegokisoli.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/zoluzejililumudizelunuf.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/63ff9037f14a5dd46c1328eb0c329c4e/weletitedatuxusepodumoxe.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160948effc09c2---68992749086.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/798660a1972dc659a365c0624c79cac1/47632935300.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608386a15ad75---muxirarekijuwekapujamojid.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac861d32f72---jokonaxubupoxon.pdf
    • https://atphp.ch/userfiles/file/77260352789.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed50.bin
e5be0ee5c5c834f9f0e92fca785fb363811efd1fbbb9c7ac1009caf4079022e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 10476 bytes
font_01_sfnt_off000104fe.bin
370ab5baf9a19063cf491f3aa3c1bafdcf107dca8cb6f8ddf3e59e31d9b53be9
pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 16580 bytes
font_02_sfnt_off00013007.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13007 16792 bytes