Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c8d27e7a6dba55…

MALICIOUS

PDF

99.5 KB Created: 2021-07-05 01:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eb23d0d0199313742d9624c56d4adc1d SHA-1: 6bea205f9e637dc56c2f85238fdd3dc39ab62f21 SHA-256: 95c8d27e7a6dba55228c80312cd340ff5baf91199ee8e04e470de06237b1b223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm hosted on compromised WordPress sites, with many distinct hosts and UTM parameters suggesting a phishing or SEO poisoning campaign. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/1j5n6k8avgjckht3c0oagotl11/92093704975.pdf In PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607615435547c---likuvowadoki.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/bf9rk5v7s6fhekon1ettmlvae7/59497768515.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c3197d825a6db89fa7a1e36729a74fd3/11005433846.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/98a239e87466cd34e558cd6c1cce51d5/xagif.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/refinedunawijiginobizobi.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/31826750674.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d558ff2e93---82301517332.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cae66f1d0e---kuwunujofapitapexexon.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105010951471505.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/nozevuruf.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160d231890f963---woxozimawibutovam.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/2aed149ad4f8248b9ee8393c8130cc62/womojuge.pdfIn PDF document text
    • http://bienbao.net/uploads/files/wonufaligidozorabalig.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/93243322037.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8e996cb2---babinekadajanape.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/67904500511.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/k3vrkp39l2qjpg6cp1ale24b7u/942900413.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/bopukufavozowaxuretipub.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dls3odcsmvnpsrh4rq9ob0thbq/buralaxe.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/55f445e4e447440ea57a1f4ce592f28a/mebapijutofewoz.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/21127556953.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/nvnhscn4u0j7l091artfkbfg13/kukebulux.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/bigit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+color+goes+with+orange+wallsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F5 18944 bytes
SHA-256: d42eb29dcfa1b50a4cf908568417175814700490fc3b5cb8268971e0a1108910
font_01_sfnt_off000142cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE2 10588 bytes
SHA-256: 04734f46db6e6927d6d50bc94478228464d2d07f46a6490bb9a0636635eb0671
font_03_sfnt_off0001731b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1731B 2696 bytes
SHA-256: 6f69f93e20d66a1e33006522955e2bcfcff950c2c9fb46ddb9dc1d8bb27d264a