Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fb36c52b139ca9…

MALICIOUS

PDF

83.7 KB Created: 2021-07-19 07:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d352fed9f313146b8eb599ae3f7c4c8e SHA-1: a4d469914055d54acf56d835db40ecdd8a782e40 SHA-256: d5fb36c52b139ca95c30598a41f6d177097ea4f77a58aeee4b36dd6ab2ea83b9
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2d811de310c35e53196eed67d8bee898/tapagamuximobimataxujetu.pdf In PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/a7e0569bdc8b696a77cb79633ca90bac/rewinekokuwepiwonuvore.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e8d28ddc---rituli.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/lkugr5n7qma2vi7job735k3rt8/87435089718.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/aj6fj1u9uvvdqhfprd02m28ln3/jokilonoxopuxamezon.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106291032103580.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a087090e487---pokubovipewigezed.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/bs07i8k8uhuie26ej6k5b32flc/wukimagetitoturi.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16074149d5606f---94808500754.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/gejarawu.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/vuwupituxupobobupazo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37d597bc92---64397589665.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f0e5c3721---41491139613.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/212aa99d162c9e840ca009b3dadc42f4/papabegegunepogaribefosub.pdfIn PDF document text
    • http://katachizu.com/img/news/files/71225195187.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/79471871750.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/pagasitulisuxefakesozu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6d225537b---67235711963.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/00b0623d7731e3f9fa04e53764f9f438/7590985363.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210522084916.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826025b6a73---69340929051.pdfIn PDF document text
    • http://agatanorek.com/files/file/99660989260.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/97171150111.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/fovakokamimonenemodovara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=you+make+me+wanna+cry+dance+for+mePDF 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_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 10608 bytes
SHA-256: 595376c25aac56b659e98b9fb9a3fb95ffefc9b7d7d8d3891f813e52d3dbf5b9
font_01_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 17552 bytes
SHA-256: b932ed4c3c803f889a70f20b5ee2200a93c3d322849518d54463df4b5d47c3e3
font_02_sfnt_off00012968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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