Malicious PDF — malware analysis report

Static analysis result for SHA-256 f899c1e9c264cb45…

MALICIOUS

PDF

69.8 KB Created: 2021-08-02 21:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c96e7a657a9b3b4a9ebaf0cca8012542 SHA-1: 266a0a410c8f95263c353b9bcc15b72741ba09cc SHA-256: f899c1e9c264cb4594271153c501c3f190db17f27a7f2a1d94019c0e545a2d7a
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8990

Heuristics 5

  • 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
  • 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://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wugavunegofubiwo.pdf In PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/adacc0413113061f4c8511815ccffc50/bugatijomosofukisama.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/98011027444.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/83656756387.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dilutuvakeraxaterefaxab.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/nelepebezojasone.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78cfcac31---betufupik.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/6ot54oacqv617l3gfpo8f69si7/gakikuroroteromotomu.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/23541c97904091012e8a1083e32730a4/wubasimabeporakerupip.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0ba159f11c99bfec5046041a79a55249/38755482530.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/sumiwuxubefufujivale.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b43330718f9---gumuta.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ba93739224a---jexobitalobikeja.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/87896507812.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/42813318395.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/5tcupr0jf15qvb8h6q7s3a7760/14941133978.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/fsq08kqgdajfiagduh6qn4hlu0/velizaxipituv.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/14bb97abce8796e09b869fdebde47801/fivalulozovazelaparufasu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/0e5bf3503ccc59a8acabdba4c862fefa/22384574554.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ba31c57996c---10186243148.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/9ccf1e8433fa0c05b752a9743158418d/sodopabutoregexafol.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/zesurula.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d4a68ea5b---tasifabodorutafikugu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a27f134a7---22734453232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+solve+buoyancy+problemsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 10940 bytes
SHA-256: 99ae0d6ccbea7c9c2e304f622afafef64fbe0a3faeb81c90397353274c3f1a05