Malicious PDF — malware analysis report

Static analysis result for SHA-256 f410a60996d42b38…

MALICIOUS

PDF

84.3 KB Created: 2021-08-29 11:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37ee18436f66ca782099a0be565c4672 SHA-1: c53526878a67491ef32f9a02a11b50fa03fe1daa SHA-256: f410a60996d42b383175d19b66ecc6eeadf7214359a4a70a0f5a70c2c124fa5f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories on various websites, forming a link farm. These links likely serve to obscure the ultimate destination and evade detection, redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://insidethedigitaltrend.biz/userfiles/file/vejovukedarileros.pdf In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608166ef2b3fb---nudolexidurasapa.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/gewixuvakajapetigifok.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/4d95c0c90b8b37e316416596f15517bc/xevasu.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/moxizuxiwe.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/35957988027.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088340c8d4b3---rilimezuveleliwuz.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e686ad8e1cb---88552640782.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/telegusodapafupipiguvofo.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bdea9f423---zamikema.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a94c4d59c24---lejugajorefer.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdb3202045---tanizavosup.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/9794bdfa55a444d48a1830578014cba3/zanojidamuzafel.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/98014393929.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad840fb95c5---mebita.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/peziranozurutijoziror.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/13460217196.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c1f987bb7---87282264577.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/miwedagesalezarikevok.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/20521896015.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/53695792887.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/nagami.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/95442313393.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a4a0435adf17814a89714623469a18db/21261756113.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/seneroxo.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0758038001627325082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=online+multiplayer+games+phonePDF 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_off0000e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 17232 bytes
SHA-256: 9f173af51968255ca1bc3f32e047370017f3eb80ba2e40fa5d3c678b58be049e
font_01_sfnt_off000110d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E9 10940 bytes
SHA-256: 0e28d625ddcb8ff5241a236e5baeaa08f58929fba5db21b9e546d61a9bbb6c52