Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc41f3a5ff01075…

MALICIOUS

PDF

113.3 KB Created: 2021-08-06 21:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19a5cea77c1889a72b058224acec45b8 SHA-1: 45b6470fe7266542bf8bec02d86ef6d75278c8c5 SHA-256: efc41f3a5ff01075b19f2a576515887468110926d966422f0df7234c03470968
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/508ab400df2646078e207d6f79ebf985/zuvixerat.pdf In PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/91bug1grg57a0t3t4cmddghgs3/80033609089.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/kugilimatutefigagap.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/79422742640.pdfIn macro / runtime command snippet
    • https://vestol.bg/files/file/81806326544.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/gozesasifesat.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609831c98f2f8---dojovivux.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ebrd5b0f9ihpdbigt1htle3il6/79052071307.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/58d87be417b36c6f400677d9cad47eef/vavamovexugoxujol.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-21/20210621003423489331.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/vagifivowewe.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/33195821251.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/52516355983.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/62112497827.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/bajozewepadamivu.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/617956409.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/42846258498.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/037fdd9b4dd27f5eba651187b79aad8c/54780176199.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a3827c993---vufijataruma.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/tubakukosobo.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/66546259410.pdfIn PDF document text
    • http://df-2.de/images/daten/file/luxalamabamumasisano.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609316214d4c6---47247459451.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/caee85eaba1d837a188b9a0b80573cfd/83934958103.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/6036be4a6ca8f72d4da9b647574539af/jasalagaketasalunajoza.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gta+vice+city+pc+free+online+game+download+windows+10+mbPDF 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_off00015750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F67 11584 bytes
SHA-256: ea17479983bf16b6109668c1dd7a9fdc0db1cd0b16fec0a76bf9329fc2906cdf
font_02_sfnt_off00018a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A9A 16652 bytes
SHA-256: ba081427f46dac364ea9660566022727fc16f5453ab314c9526086a117a75506

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