Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42483001e59741a…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 16:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9e368b2e3d8d92fdfdbe44079e47d02 SHA-1: ffa85eebd8095a6de1941d60ba503fc7918397b2 SHA-256: e42483001e59741aaa7cd53a591a4a17c60a408fddfabe469db071fb68c79dd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or to distribute further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35de9d51988d31ffdbdd09fc1534d05b/80713979101.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608303fabdd39---bodowikofu.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9577fcca242cc2a6bea50a3c58d11cbd/79091875425.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fda500ce1---12376475267.pdf
    • http://smeclassof1987reunion.com/clients/37165/File/diferonegivefaxa.pdf
    • https://golf-tout-terrain.com/publish/page/file/19240158379.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/2i9jgu65qosvdd42min4qapv9t/65289507109.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16078adea2dd09---3221454375.pdf
    • http://championsview.net/userimages/62784540279.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070685dc3894---jowamumalirozagidep.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/473181f8a576c9364dd5d780deb09c02/nulevalaropagufogabaranaf.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/nf6msegjsvh4n011m53h5q8n48/90070301401.pdf
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/20520103170.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09bf1c60f8---sonadumunijukumukuva.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160802173b9f23---xudit.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/08c886e76013e3c04dd0c6530504fbbf/sadefiwalax.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/5181c1904866d7014b5ac9298afd84d9/36324286253.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a623a7f087c---55414966493.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6301c2daa---gemaxinesi.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d189b50f66b---87198032583.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/95c5eaeb956819b080fdd72e8600e6d8/68134018342.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8b111f5b---rofusugud.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712283e6173---pevewuka.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sweating+without+fever
    • 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_off0000e912.bin
6bfd108b137ba2b431327dfa339d245717e291f4a7a82ded0a464455086c2272
pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 16368 bytes
font_01_sfnt_off0001137f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1137F 16792 bytes
font_02_sfnt_off00012b96.bin
97507ce69cc027891de2f3e6951a3cf4ea17e0ba250b7347c34cd7e8e9dc3fb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B96 10608 bytes